01 vulcan rough idle / missing
alright, this is starting to piss me off right about now. the rough idle problem has been going on for a while, but was never serious, just a little fluxuation at idle rpms. well this past wednesday it started driving like complete crap and i got the blinking check engine light. limped it back home, ran the scantool past it, i have codes ranging from p0300 - p0306 [misfiring] excluding 302, haven't seen a cyl 2 misfire code yet. i've replaced the spark plugs and wires [car started running even crappier, but it is firing off of all 6 cyl's and all the plugs / wires seem to check out ok] also swapped the coil, no change in performance. swapped the IAC, still no change. exhaust smells of fuel, even when i pulled out the spark plugs it seems to smell overly rich [that's why i haven't swapped the fuel filter, etc yet because it seems like i should be aiming away from those options, imo]. also the missing isn't consistant at all. it can go fine for up to probably 30 seconds without a miss, and then sometimes it sounds like your popping a bag of popcorn under the car. the engine runs smoother above idle [less vibration], but misses through out the entire rpm range. please help before i turn this car into a new years light show tonight.