Problem: Upper RPM stumble / let up in power - intermittent. Feels like a momonetary (or not so monmetary) lift of throttle. More common when car is at full operating temp, sometimes felt at mid throttle stomp but mostly in 3rd or 4th above 4k.
I thought maybe clutch slip but I only have 10k on the grizzly street (kevlar puck) setup. OBD-II captures of MAF, O2 and RPM vs speed haven't shown anything conclusive (to me) yet.
OBD Data:
Long term fuel trim on bank 1 is like 18% at idle, but as rpm increase trim drops and goes negative by a few percent above 4-5 k.
FT bank 2 is about 12 and remains constant through rpm's.
Just recently picked up a few type B misfires (no DTC's yet) from cylinder 3.
Manifold vacuum is a rock steady 21".
Fuel pressure is like 34, just a bit under the lower limit of 35.
Cylinder 3 plug and wire look more or less brand new ('cause they more or less are).
Soooo - anyone have any suggestions? Maybe cylinder 3 injector crapping out on me?
I have no cats to plug, a new MAF, fuel filter and relatively new plugs and wires.
Would appreciate thought or suggestions from the experts or non-experts with an opinion
Thanks alot -
