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Idle inconsistent 900

posted by  volvitowagon on  Thu Jul 18 11:33 CST 2024
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900, B230 engine. The idle is normal but down the road drops rpm to a rough idle. If I put the car in neutral or park the idle is normal. When I turn the engine off and start over is normal again gear engaged. I may go bad again or sometimes I get home after several miles and still normal. Next day things repeat. If I use the AC seems worse.
Seems like a lack of response to compensate the idle speed "up" when the gear is engaged or the AC, but not always sometime is fine for the whole trip. What can be causing this. Thank you. I have not posted here in years, good little car.





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