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2004 gmc envoy_slt
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69 Posts
Discussion Starter #1
04 Envoy 4.2.
When outside temp is below 40 it has good throttle response and runs like Jack the Bear. As the Temp increases, it gets sluggish like its pulling a weight. The warmer, the more sluggish. Grades that it takes in stride when cooler, in warmer temps it takes more gas pedal and sometimes down shifts out of OD.
Temps in the 60’s lately has it rearing it’s ugly head. Any ideas?
 

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2004 chevy trailblazer_lt
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258 Posts
Have you scanned for any OBD2 codes? Have you checked the fuel pump pressure? How about the fuel pressure regulator?
 
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