5.3 throttle hesitation after idling

[ga sierra]

I have a 2006 Sierra. I’ve had this problem for a few years. Recently had a new engine installed. New plugs/wires. Reused intake off old motorAnd was cleaned before reinstall on new motor. I have the same problem with new engine. If I sit and let the truck idle for 10-15 mins, the throttle hesitates on take off. I if stop and cut the truck off for a couple minutes, the problem goes away. Before new engine, I would clean throttle body but that would not fix it. I’ve searched and can’t seem to find someone with the same problem. Any ideas???

[kstruckcountry]

Clean the MAF sensor.

If that doesn't help, find someone with a pro scanner to hook up and watch parameters.

If it is sitting and running on a very hot day, some hesitation may be normal until it gets cooler air. My intake air temp usually gets to 130 or so pretty quickly idling in the heat, which does make a difference.

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[ga sierra]

I’ll just replace it and give it a try. It does it when it’s cold out too.