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Vectra Idle - trickynicky
My 1997 V6 Vectra has developed an irritating idle fault. When coming to a halt the tickover sometimes drops to 250 rpm and then recovers, or drops to 250 rpm and then the engine stalls. Restarts ok and ticks over ok.It sometimes does it after idling ok for a while as well. Also, when turning on the air con, the normal slight rise and fall in rpm, is sometimes 500 rpm or so. Recent coil pack change to cure continuous misfire 2 months ago. I have cleaned out the idle air valve a couple of times but I'm not sure that it had much effect. Any ideas?