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Old 07-23-2002, 08:07 AM
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I had the same problem on my 93 300E2.8 about a year and a half ago. At idle, it would vary between maybe 450 and 1200 rpm in cycles of maybe 10 to 15 seconds. Otherwise, the car drove great, so good you had a hard time believing something was wrong. The gas mileage was normal as well. In my case, the check engine light come on and the code said it was the air mass sensor. I replaced the air mass sensor--immediate cure. I bought it at Fast Lane and I think it was about $230 but Fast Lane says it is unavailable right now. If you could find another car and swap to troubleshoot, it is less than five minutes to change. As I understand, if you have the equipment, you should make some adjustment or change some setting after changing but it you do not, the engine's computer will finally adjust itself.
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