[patmchugh]

Not too long ago, i was driving along and my 1987 535is engine started to pull instead of push. The engine refused to generate power and i barely made it to a parking lot. I could not find a tow truck that was able to tow it, because it rides too low, so i went over there (it was 36 degrees) with my tools and replaced the distributor cap, rotor, and coil, thinking that i had blown one of the three. All three were in very bad condition, and were ready to be replaced, but the car still had the same symptoms. The symptoms are: The car starts fine, and idles ok for a minute or so, then it idles at 500rpm and very rough. THe engine will sort of rev, but it will not give constant power. If I give the gas pressure, the rpm's will rise, then fall, and the engine will die. I thought that it might be a clogged fuel filter, but that didn't help when i replaced it. Both fuel pumps are working. I decided to test the fuelk pressure regulator, by squeezing the return line to build pressure and the engine ran properly!! i replaced the fuel pressure regulator and the car still had the same problem. I am absolutely stumped. Any advice on what to try next?