2003 GMC Envoy surging once engine warms up

Asked by Apr 05, 2016 at 02:41 PM about the 2003 GMC Envoy 4 Dr SLT 4WD SUV

Question type: Maintenance & Repair

When driving it slams into gear when shifting, once
driving for 30-35 minutes the rpms will begin to
surge up an down, if I push the gas harder it will
stop for a little while, but starts again. If it is COLD
out 20 and below it does not surge but still slams
into gear.

4 Answers

5,965

test the air intake sensor...wire might have fallen or vacuum source or gasket might be at fault https://www.google.com/? gws_rd=ssl#q=2003+GMC+Envoy+air+intake+sensor

2 of 2 people found this helpful.
5,965

intelligence to the Fuel system is provided by this sensor~ your descriptions sounds like there is NO control over the air/fuel mix~

1 of 1 people found this helpful.
71,375

Agree with bob,you have a vacume issue,or air leak.

1 of 1 people found this helpful.
5,965

seen intake gaskets go bad...you might just listen to the engine...perhaps through a cardboard tube....might be your problem too~ would run kinda unevenly tho~ ssss ssss ssss..then you'll know to invest in an intake gasket~

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