hey guys, got a problem with the 99. I've been getting both cylinder 5 and 6 misfire codes. I have replaced the plugs with NGK, wires and coil pack and reset the codes only to have them ocme back over and over again. I have officially run out of ideas, please help me out.

Thanks in advanced.

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1999 Ford Ranger 3.0l, 4wd, M/T, rear locker, SC Tuner, 2 10"s sitting on 30"s (Daily driver)
1986 Chevy 3/4 ton built 350 2wd A/T 5MPG (My toy)
2004 Subaru WRX stage 2 290hp (wife's Daily driver, My turbo toy)

Injectors? have you tried a compression test on those two cylinders?

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2000 Ford Ranger 4X4 5.0L V8 manual transmission
1.5" Wheel spacers 365/75-r16 tires 4:10 diff, cranked tbars
K&N cold air intake Magnaflow Custom exhaust Custom Dents in fender and box- Priceless!!

2012 TDI Golf tinted windows, 6spd manual

Injectors are fine, I have not checked the compression yet was gonna do that tomorrow. what would be he problem if the compression is off?

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1999 Ford Ranger 3.0l, 4wd, M/T, rear locker, SC Tuner, 2 10"s sitting on 30"s (Daily driver)
1986 Chevy 3/4 ton built 350 2wd A/T 5MPG (My toy)
2004 Subaru WRX stage 2 290hp (wife's Daily driver, My turbo toy)

burned valves, sticky valve lifters or bad compression rings on the pistons.... You could try an oil treatment with an oil change to see of you could unstick the lifters...

Well its weird because it runs fine except for a rough idle. Wouldnt that effect it significantly?

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1999 Ford Ranger 3.0l, 4wd, M/T, rear locker, SC Tuner, 2 10"s sitting on 30"s (Daily driver)
1986 Chevy 3/4 ton built 350 2wd A/T 5MPG (My toy)
2004 Subaru WRX stage 2 290hp (wife's Daily driver, My turbo toy)

Does it run rough at idle?

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Sorry. Didn't read previous post haha. How about web you drive it? Does the light blink?

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2001 Ford Ranger Edge 3.0 auto | Push bar | Offroad lights | Toolbox | CB | CB whip | Tow hitch | Black Taillights | Marker Lights | Headlight mod | Silverstar Ultra ZXE | Pioneer Head Unit | Cold air intake | Mustang Dome Light | Cargo Lights | Expo OHC | Expo White Gauge Cluster | Auto Dim Mirror | Sliding rear window Mod | 05 Chrome Bumper | 03 15x7 Alcoas | 31x10.5x15 Cooper Discoverer A/T3

No, it doesent blink just stays on. And the compression is fine nothing weird or outta place could it be that im using ngk plugs? Somewhere I remember someone saying to only use autolites or motorcraft plugs for the 3.0s. And while driving it seems fine runs smooth no sputtering or stalling

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1999 Ford Ranger 3.0l, 4wd, M/T, rear locker, SC Tuner, 2 10"s sitting on 30"s (Daily driver)
1986 Chevy 3/4 ton built 350 2wd A/T 5MPG (My toy)
2004 Subaru WRX stage 2 290hp (wife's Daily driver, My turbo toy)

OMG. Haven't you heard ? Won't run right unless you have MotorCraft plugs.

I wasent sure if that was some dealwr thing or actually legit. Guess ill go pick up a set, any idea why? The PO ran bosch platinum 4 plugs with the same issue and those are $8 a stinking plug :O

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1999 Ford Ranger 3.0l, 4wd, M/T, rear locker, SC Tuner, 2 10"s sitting on 30"s (Daily driver)
1986 Chevy 3/4 ton built 350 2wd A/T 5MPG (My toy)
2004 Subaru WRX stage 2 290hp (wife's Daily driver, My turbo toy)

Alright quick update replaced the plugs with motorcaft which pained me to remove my nice NGKs and put in those pieces of crap. But so far no codes, and it seems to be running very well ill update as needed after I get a few more miles on them.
Thanks for the help

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1999 Ford Ranger 3.0l, 4wd, M/T, rear locker, SC Tuner, 2 10"s sitting on 30"s (Daily driver)
1986 Chevy 3/4 ton built 350 2wd A/T 5MPG (My toy)
2004 Subaru WRX stage 2 290hp (wife's Daily driver, My turbo toy)

Alright so much for false hope, so after replacing my NGK spark plugs with motorcraft plugs, checking the gap on every single one of em, still got a po305 code so I switched the plug wires around to see if maybe it was a bad wire, still got a po305 code.

soooooo this tells me that theres something wrong either inside of the head or block, injectors, or ignition system.....

I pulled the plug and found that it was damp with fuel, no oil on the plug at all, so fuel seems fine, rings are not bad.

any one have any advice on what else I should check? im thinking of pulling my valve cover off and checking the springs and valves, but the compression test didnt show anything out of the ordinary?

any ideas are deffinately appericated.... cuz I am LOST.

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1999 Ford Ranger 3.0l, 4wd, M/T, rear locker, SC Tuner, 2 10"s sitting on 30"s (Daily driver)
1986 Chevy 3/4 ton built 350 2wd A/T 5MPG (My toy)
2004 Subaru WRX stage 2 290hp (wife's Daily driver, My turbo toy)