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tracing a stuttering/misfire issue

F

fst

New member
Currently having a misfire/stuttering issue at the following areas ONLY:
Between the 4000-5900hz with converter locked and TPS around 25-30% (converter unlocks at 30% and above)
I sprayed the MAF cleaner and no change
I currently have P0300 turned off cause of my VS cam
Runs fine in boost

last resort would be to turn the P0300 back on to see what cylinder’s misfiring, if at all but was curious if anyone would be able to know right off the bat the issue. My thoughts are the following:
plug wires has some miles on them but can’t recall how much, maybe 50k miles?
Plugs are AL103 gapped at 0.050 and has maybe around 6-7k miles
ICM
Voltage’s around 14.6
 


wideband AFR's on the leaner side ~15.0, but i also richened it up in that MAF range to ~14.2 to see if it changed anything but to no avail. plug gap is possible but also may be the AL103. whats the standard life span of these, 10k miles? the 6-7k was a guesstimate. wouldnt hurt to get new ones and gap them smaller than 0.050? 0.045-ish?
 
so i think the stuttering at cruising speeds was not a misfire but the TCC selenoid since i just got the stupid 0742 light come on. :-( and i just noticed theres a buzzing sound coming from the tranny itself after a bit of driving (doesnt do it right away but only after driving for a few minutes).
 
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