I'm at a total loss here guys. I have a stumble that I just can't seem to fix.

The following parts have all been replaced to no avail: Opti, plugs, wires, coil, coil wire, O2 sensors, fuel filter.

The car runs great unless you get on it (3k+ RPMs). But once I go to WOT, the car won't pull smoothly to redline.

I was told that If I reduce the plug gap to .035 from .050 that might do it. But doesn't that also mean my ignition is weak for some reason?

Please post ANY ideas you might have.

 

This may be totally wrong, but it could be your VSS (vehicle speed sensor). Replacing that fixed my low gear stumble, and it never turned on my SES light. A guy at a tranny shop told me it was bad, replaced it, and now it drives great.

just an idea...

 

It's not just in low gear though, it's in all gears.

TTT for the night crew.

 

What's your fuel pressure? Have you ever cleaned your injectors?