What about a new MAF?
At this point I might just start testing everything mechanical. We gravitate toward tuning solutions per this forum, but there is a host of other mechanical issues that could cause this.
I see the results in the log, but I also can't see a direct issue with the tune..
I tried another set lastnight. Also checked fuel pressure and it's fine. I had a tuner tell me that it could possibly be a bad valve seal giving it a false rich condition. Never really heard of this but I guess I'll pull the valve cover and have a look.
Hmmm... valve seal (lets oil in) or valve seat (lets compression out)...?
Ok, Shawn said it, back to basics, check valve springs, pushrods, rockers, leakdown test.
Did you check the fuel pressure when the condition was active?
Al
"Trash that carb and get Injected!"
I'll swap the Maf out from my vette and try it. He was talking like oil could be getting in and changing the mixture but I don't really think that's the problem
Lifter bleeding down when warm?
I have an issue similar to this with a cold start, caused by the lifters bleeding down overnight.(In winter) If you were running the sewing machine oil the books recommend with good valve springs you could possibly get this effect with a hot engine.
The Tremor at AIR
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