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2003 gmc sierra 5.3 186,000 miles

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Feb 27, 2018 | 9:57 AM

Rickomatic

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2003 gmc sierra 5.3 186,000 miles

when truck is ideling with the heater on the rpm go,s up and down like it wants to die. i have cleaned the throttle body and mass air sensor and still does it . Any ideas what is wrong?
Thanks Rickomatic

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