1993 BMW 316

Engine Performance problem
1993 BMW 316 4 cyl Two Wheel Drive Manual 75,000 miles

After putting oil in my car over a week ago, I was refilling my wipers and noticed my oil filler cap was missing, I hadn't noticed any engine problems in this time. I immediately bought a replacement cap, but ever since putting the replacement cap on the engine on start up is erratic with the idling speed going up and down before settling after a minute or so.
June 3, 2009.

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