3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
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What could cause an 86 BMW 325ES to suge when the throttle is held steady?
In other words i don't move my foot on the gas pedal but the car surges up and down in RPM.
I get a little bit of that. It could be something with the throttle cable, or more likely just dirty injectors or some other clogged part of the fuel delivery. Your oxygen sensor could be cracked as well, but in that case you'd have a few other additional problems that you didn't mention.
For starters, clean the throtle body valve. Then clean the idle air motor it could be sticking. Then check your air meter, the box that houses your air filter (mass air flow sensor some call it) move the valve in there slowly by hand and see if you feel any resistance or binding.
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