Question about 2002 GMC Envoy

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Hello I have a 2003 GMC Envoy with 200.000KM on it and when I got my cruise control on, the RPM will fluctuate from 2500 to 3500 up and down. It never happened in the morning but in the evening after work. I leave in Kuwait and in the evening it's very hot here 120 degrees. Also when I drive the car it feels heavy like if I was pulling something.Sometime even if I push hard on the gaz, the car won't go pass 120 kmh or 140 Kmh. I got a tune up done changed my full pump, fuel filter I changed the trans. oil, filter, gasket I don't and the problem is still happening can't anyone please help me?

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Check for vacuum hoses under the hood that may have small leaks ?

Posted on Jul 31, 2010


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Roaring engine noise in cab when idling. Idles at 500-950 rpm..When raising rpm in idle noise goes away.2002 GMC Envoy 6 cly.

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