What is your question?
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What is your question?
have new iac and rebuilt throttle body from rock auto. Idleing at 1800rpm with or without iac in place.
What makes this problem better or worse?
N/a
How long has your 1994 GMC Yukon had this problem?
long time
1 Reply
Possible damaged throttle body to intake manifold gasket = vacuum leak. Closely inspect for other possible vacuum leak source. Completely block off IAC port on TB - idle should be at minimum or engine stall.