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Seems like everybody is headed in the same direction. I think everybody is just calling the idle stabiliser different things, cold start valve, etc. Don't know of but one failure on this, trash in it and wouldn't idle cold. Then it would be the same symptoms after work or all night with richness. A potential failure is a bad coil in it and the valve staying open all the time. I think this would act like a vacuum leak and idle real high when warmed up. Best bet would probably to check the plugs and look for one with excessive darkness and that may be a leaky injector.
drew1
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