Hi everybody, i'm brand new on here. I have an 03 ranger edge 4x4. Its got the 3.0 with the 5 speed. As far as modifications its got the superlift 4 inch lift with 33's. prerunner bumpers, k&n intake and flomaster exhaust. its go 118,000 miles on it. i've owned it since 06 and have never really had any major problems with it.
A couple weeks ago i noticed when i first start it, its idled a little rough, but once it got warmed up it would run fine. Also around this time it started idleing real high. i would pull up to a stop light and it would creep up to 3000 than go down to 2000 and back up again. Not too long after this my check engine light came on, so i took it to autozone to have it read and it said cylinder 4 misfire but nothing about the high idle. The guy told me it was probley the idle air control valve so i got one of those and also new plugs and wires. i first changed the idle valve and it changed nothing than i put the plugs and wires in and it than actually ran worse. someone else had mentioned that the idle isue could be the throttle position sensor so i pulled it off and cleaned it up and that actually fixed the idle isue. but it still runs like crap. so next logical thing i could think of was the coil so i got a brand new one and that didnt do anything. After this i took it back to have the check engine light read and now it said cylinder 1 misfire and also multiple cylinder misfires detected.
at this point i have no idea. its to the point where i can barely drive it because it runs so bad. its mainly between 1000 and 3000 rpm u can hear it missing the most. anybody got any ideas? fuel injectors? vacume leak? also has anybody had any bad experiences with the bosch platinum 4 plugs cause thats what it has in it. Although i had these in it before for probley the last 2 years and it ran great. I did have bosch wires and now i have the regular stock kind from advanced auto, could that be the issue?