| Njtech, thank you for the reply. I bought all the tune up stuff, but I want to nail down this problem 1st before any maintenance work is performed. It’s not a random misfire, but like the engine computer is commanding a fail safe mode, or limp home mode at exactly 2000 RPM. My best tool at this point is information. This is what I have in my tool box so far;
Mr. Sparks made a post in another forum back in 1998 stating he has his 82 528 in a BMW dealer with the same symptoms as my 88 528. Here are the things that Mr. Sparks tried to fix his car.
What we have examined so far: Fuel pressure and flow rate - OK. Coil, plugs,
wires, condensor, rotor - Checked all OK. Air mass flow meter - put in good
one to test - No improvement. Motronic brain - put in a good one to test - no
improvement. Fuel injectors - put in good ones to try - no improvement.
Vacuum leaks - None. Catalytic convertor - checked but not stopped up. O2
sensor - Checked OK. Speed sensor and TDC sensor - checked OK, but could be
going bad at higher rpm; will replace next and then try. Throttle switch -
checked OK.
So what did Andy Sparks do to fix his car? I couldn’t find any reply, or any fallow up that supplied any clue to what he did to fix it. The question is what engine management event takes place at exactly 2000 RPM? | 
