Must be the season for this problem! My newly acquired 2003 Envoy is having the same issue! She's got about 106k on it runs great always just hesitates from a dead stop - usually the first few of the day then warms up and is fine but behaved the same in 20 degrees vs 70 outside so not really warms up more like runs for a bit. Also sputters a little on shut down, thought maybe a mount but they at least look fine. noted the sending unit out of the tank has a bad gasket and is leaking, it does not stop filling when i get gas - figured maybe this is why but now I wonder. Going to seal that up and clean the throttle body's, hoses mentioned et all - the whole deal in the video and see where that gets us this weekend, luckily, I got a friend knows what he's doing more than I do but I'll post here if it happens to fix it. Thank you for the informative video and thread!