No power getting to engine/Rough idle. Only at startup. W126 560SEL
The car starts fine for the most part. After startup if i try and accelerate down the road i just get a lot of black smoke out of the tail pipe and no power. The RPMs will not go above ~800-1100. Once the RPMs manage to climb above maybe ~1200-1500(which could take up to 20seconds of just giving it gas waiting for it to kick into gear) it will all of a sudden kick into gear and run smooth. Once it stops doing it that first time most of the time it runs and idles perfect. If you then shut the car off and start it right back up it will then do the same thing. No power getting to engine,Climb above 1500 RPMs and start running good, Run fine until you shut it off again.
It makes me thing its something electrical since it only happens after you turn the car off. I changed the oxygen sensor. Maybe the OVP relay? Someone at some point had messed with the ?lambda tower? as i believe there is supposed to be a ball bearing in the top and that was gone, it idles so good otherwise i wouldn't think that would be the problem anyways.
I have been trying to research it but it seems like there are so many components to the fuel system im kind of lost on where to start. Any help is appreciated.
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