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1988 E30 M3 Stumbling problem (archive)

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Posted by Tim Suddard on August 06, 2000 at 10:50:42:

After doing a complete, professional tuneup with new wires, cap, rotors, plugs, valve adjustment fuel filter etc. we are still having a problem with an off idle stumbling problem. At idle, the car runs perfectly and at over 5000 rpm the car runs perfectly to redline. Trying to cruise at 3000-3500, the car bucks and stumbles. I know the E30 M3 is known to be a little rough and buzzy, but I don't remember them running this badly. I am sure we can find the problem, but thought someone on the list could save us some time. Any suggestions?
Also, if you want to see our Grassroots Motorsports magazine project E30 M3 and keep up with our progress, please check out the project car update section on our website:

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