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I had a similar problem. Its the idle control valve staying open when the car warms up, exact problem I have yet to determine. I removed the idle valve entirely and blocked off the ends. It idles great once its warmed up, when its cold it wont idle at all. I think its the AFM in my case, DME temp sensor is new. I have a spare afm but no time to test it in the car.
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'88 944 240,100 miles -race car
'05 Boxster 110,000 - Daily Driver
'74 911 Targa - long term project
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