Ok.. been bugging me for a while. Been doing lots of work to make sure the engine is top notch. Vacuum leaks fixed, etc.

But when I put it under load, mainly (maybe only) at low speeds, the car will make a low end noise that I can only describe as a rumble. Its may also sound like a major missing or major engine retarding. Its a VERY noticable change in engine behavior. Sounds like it comes from the right side. When it happens the car also seems to dog down big time.

I can probably get a recording if needed.

The car has newer injectors, wires and dist. I am taking the dist apart later tonight to inspect. I just pulled the plugs, they were gapped at 0.045 and I reduced them to 0.032". But it was doing it before this.

Thoughts?

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car