[Ken]

Thanks ukrkoz,

I ran a bottle of fuel system cleaner through it last month, changed the plugs and wires and 12V battery. We just bought the vehicle used, and it needed some TLC, the battery had a bad cell and still had the original spark plug wires, and I assume spark plugs at 106,000 miles! Anyway, A new air filter is going in it today, and I will remove and clean the throttle body, I’ve read lots of GM trucks/SUV having sticking blades so its worth a shot.

According to the article I read about this GM 2ML70 transmission, the HV batteries run the electric AC compressor at all times. It is odd that I only have this stalling/stumbling/hesitation issue on hot days. Its common on GM truck hybrid threads over on greenhybrid.com, yet no one has seemed to find a good fix, not even GM. The hybrid tech working on my car didn’t seem very confident in his diagnosis. I wish I was in a carb state for that added warranty.

[Ken]

Here is a link that explains the hybrid system in depth, especially the transmission. it seems odd to me its only stalling/hesitating when the AC is cranked up.

http://www.atraonline.com/gears/2009/2009-04/2009_4_34.pdf

[Author]

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