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70 Deville 78 Seville 92 Deville 03 Deville
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1,316 Posts
It's probably your idle air control, those were a common failure point. I think it may have had a different name back then. It just twists out of the throttle body and is probably hard to find now.
 

· Registered
70 Deville 78 Seville 92 Deville 03 Deville
Joined
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1,316 Posts
Oh yeah, fast idle heater, I knew it had a different name. Back when I was running the FI I had a cold idle problem and a new fast idle heater cured it. I guess yours isn't so easy. I wonder if you may have a vacuum leak or possibly a simple failed temp sensor. I guess I should ebay some of my FI parts this winter.
 
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