Quote Originally Posted by Al Fernandez View Post
So back to the symptoms...it starts and idles cold, revs fine cold. Once it warms up it hesitates like mad when trying to rev it and if left to idle it stumbles to the point of stalling. Have you put it under load when cold or only once warmed up?
It only really stalled and stumbled horribly at idle once or twice at TWS after a couple full throttle passes up/down the entrance road.

At Houston it made about 3 laps from cold for Race 2 when the problem first started. Started making that "whirin' sound" which was a combo EGR block-off leak and blownout exhaust gasket on 8.

When I was doing the PCM scans in the garage, it seemed like the passenger floorboards got hotter than I rememberd. Next step is still to pull the cat and put in a muffler. Since the scans look really pretty decent (a little rich down low off throttle, only DTC codes for missing automatic trans and emissions), Casey jump in if you disagree, I'm thinking it's a backpressure issue due to the cat failing.

(NOTE: I called the local muffler place and was told the owner won't let them cut out cats even on off road vehicles. So I called my State Rep to complain about increasing government intrusion. And why in the hell does the fair state of Texas need to collect 6.25% sales tax on every used vehicle sale? BS, I say.)

What say you, Mr. Cake?

ps - I'm registered to do most of a day at Grandsport Speedway, CCW if that matters, on Sunday, 5/22. Gotta make sure I have something to drive at Hallett.