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2003 gmc envoy 4.2l i6
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Discussion Starter #1
So I have a gmc envoy and when I start it up in the morning It used to have a super rough idle it would vibrate the car really bad does anyone know how to fix this
 

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2004 gmc envoy_slt
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What do you mean "used to have a rough idle"? Does it still have that? Is the Check Engine light on, have you checked for codes? If you increase RPMs, does rough running stop? Need more info.
 

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2003 gmc envoy 4.2l i6
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Discussion Starter #3
It does but it is not as bad if i increase throttle it goes away but it is only when I’m in drive and I’m stopped it has a rough idle and the check engine light is not on and it does not have any codes that I know of
 

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2004 gmc envoy_slt
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Probably want to check the motor mounts, worn motor mounts can cause vibration at idle. Another thing to do is clean the throttle body front and back sides.
 

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So I have a gmc envoy and when I start it up in the morning It used to have a super rough idle it would vibrate the car really bad does anyone know how to fix this
basic thing is to check spark plugs, check history when was the last time it was replaced?
 
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