HMMM. 1988 760 Turbo with roughly 150k mi on it. Clean air filter, mostly new vacuum hoses. New plugs, wires, distributor and cap. Cleaned injectors. Recently set idle mixture to just a touch richer than stoich, so I could pass emissions (used to be solidly rich, but not because I set it that way, just how it got old). Base timing looked alright. Running 5w30 oil in a little hotter weather than I should...gonna take care of that soon.


I can't get the car above about 4500 to 4700 rpm. Someone in IRC had suggested a plugged cat. I removed the testplug right before the catalytic convertor, but it only helped the situation only the very slightest. It could still be a backrpessure issue, I dunno how much that test plug does, it's not real big.

Here's how it goes: you press the pedal however you want, floor it and hold it, press it gradual, the engine revs quick to about 3500, and slowly up to about 4700 and then just looses it. I thought for a while it was trying to shift, but I think now that it only feels like that, that the engine is just letting off so much that it feels like the beginning of a shift (auto trans will do funny things). What happens after 4700 is the rpm falls down to about 3000 and just sits steady, boost goes to zero--even pressure--and the car will just sit around 40mph. If I let off and re-press the pedal it'll be back on track. If I hold the pedal it sort of hickups with 1 second of moderate boost and acceleration, another second of sitting around at no boost, and so on.

I suppose it could be a number of things, but just shoot away
Thanks!
-Matt