Just bought this truck for my sons' first vehicle. When I bought it, it ran with a lil skip. I put on all new wires and plugs. While i was at it, I took off inspected and/or cleaned all sensors that needed it. I also put some Sea Foam through it to rid it of the carbon build up. Since then, it has ran like CRAP!!!!!!!! Any fresh ideas as to what this could be??? Please help before I break out the TNT!!!

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Ole Blue!!

96 Ranger Ext Cab, 2WD, 4.0, Automatic

I assume you cleaned the MAF?

These trucks (93-01 4.0 V6's) are known for popping the valve seal, I just had the heads redone in mine about three years ago. Check the leak down, and compression. It will generally give you a code for a misfire.

Clean the injectors, and run some IsoHeet through it, change the fuel filter also.

What did the plugs look like when you changed them?

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97 Ranger - 4.0 V6 auto, 4wd, 31x10.5x15s Wild Country XTX Sport All Terrains, Warn locking hubs, Pioneer deck with iPod attachment, Snugtop Topper, K&N filter, scan gauge II, Hella 500 Lights, More parts coming, waiting for the paycheck to get bigger!

Truck built in loving memory of Norm Howard
Outcast Racing
PNW Crew!!!
Afterhours Clan!!

I sure did. i cleaned all the sensors just as a precautionary thing but ever since i ran sea-foam through it, it hasn't ran right since. just a few minutes ago, i came in from work and tried to fire it up to test a few things i've read about on here, she wont even fire!!! i replaced the fuel filter when i done the plugs. The plugs were not bad looking, just old and i seen one of the wires had a rubbed spot on them. Soooo aggravated at this thing!

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Ole Blue!!

96 Ranger Ext Cab, 2WD, 4.0, Automatic

You sure you got the plug wires on the coil correct?

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1999 Ranger 4.0 and extreme Snap-on tool fetish

yep! checked, double and triple checked! i just dont get it!!

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Ole Blue!!

96 Ranger Ext Cab, 2WD, 4.0, Automatic

Have you changed or tried cleaning the iac valve

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2000 XLT 4x4 EXT. CAB 4.0/Auto Trans/3.73 gears/
31x10.50 BFG Rugged Terrains on MB Motoring Wheels/Pioneer Head Unit/JBL 12"/Camo Interior/'03 black and grey 60/40 seats/ green LED's Under Dash/T-Bar Crank/Windows-20% on the front, 5% on the back/Mustang Dome Light/06 Tails/

I have

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Ole Blue!!

96 Ranger Ext Cab, 2WD, 4.0, Automatic

Fix it yet?

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97 Ranger - 4.0 V6 auto, 4wd, 31x10.5x15s Wild Country XTX Sport All Terrains, Warn locking hubs, Pioneer deck with iPod attachment, Snugtop Topper, K&N filter, scan gauge II, Hella 500 Lights, More parts coming, waiting for the paycheck to get bigger!

Truck built in loving memory of Norm Howard
Outcast Racing
PNW Crew!!!
Afterhours Clan!!

I am having somewhat the same problems with my 99 4.0 V6. Today i cleaned out the fuel tank again and put new gas in and flushed the lines again and it still cranks up, revs up when i press the gas and then it starts dying down and cuts off. I have replaced the following:
IACV
MAF
TPS
EGR
Spark Plugs
Spark Wires
Coil Pack
Fuel Pump/strainer/filter
Air filter
I put a new battery in it aswell and due to it not idling like it should the alternator cant charge the battery so I had to charge it. I havent checked the fuel pressure but I am going to do that tomorrow. I havent even had any error codes. I am wondering if the exhaust has anything to do with it? I dont know what else to do besides towing it to a shop.
All help will be greatly appreciated. Thanks in advance.