2003 Chevy Trailblazer Idle Fluctuation

2003 CHEVROLET TRAILBLAZER
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BLBURGESS
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2003 Chevy Trailblazer Engine Size unknown All Wheel Drive Automatic 92000 miles
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My idle fluctuates when I switch from the heater to the defroster. The RPM's go up and then down. Then the car shuts off. No lights come on in the dash either. I took it to the shop, and they told me I needed a tune up, because there was a misfire I am still having the same problem. PLEASE HELP.
Jan 21, 2008 at 6:45 PM
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2CARPRO JACK
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When you turn on defroster it turns on the a/c , so an idle fluctuation up is normal, but it shouldnt die. Try cleaning out the throttle bore around the butterfly with carb spray and a rag. If doesnt help it might need a new throttle body.
Jan 22, 2008 at 7:58 AM