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Rough idle, stall, racing, but starts OK 200 1991

Car starts fine whether hot or cold. Idle intermittently will run up then down, and/or will drop and eventually stall if I don't kick the accelerator when it does this. The other day the revs went up quite a bit between gearchanges. Engine power seems normal and there is no stumbling or miss on acceleration though there's a slight hiccup when cruising at highway speed sometimes. On a cold start sometimes there is a miss and I have to hit the pedal to keep her going.

This is a 5-speed, 136K miles, LH 3.1 I think.

Any ideas? I'm taking it to my Volvo guy on Monday... hope it's not expensive, just got laid off. If it is the AMM will one form a LH 2.4 car work? There is one on ebay for $30. Thanks.






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