Mechanics

I HAVE A CHEVY WITH A 2.9 5 SPD. IT SURGES MAINLY IN 3RD GEAR WITH SOMETIMES A STUMBLE IN 4TH OR 5TH. ANY IDEAS WHAT COULD CAUSE THIS?

2008 Chevrolet Colorado • 45,000 miles

I have a 2008 chevy colorado that is a 2.9 5spd that surges mainly in 3rd gear. Starting up a steep grade from a stop makes it worse. It does not feel like a miss and the rpms never rise when it does this. I cleaned the electroc throttle control and checked for codes and none are present. Any ideas what this could be?
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I hate chevy's 1982
February 25, 2012.



Check the fuel pressure and test the TPS and MAP sensors-

Rasmataz
Feb 25, 2012.