i have a co worker that is haveing this problem with a 99 sierra 5.3 4x4. when he mashes the gas it has a slight hesitation there i no check engine light on and he has new plugs and wires, air filter, on a motor with 110,000 miles i am going to clean his MAF tomorrow and see if that helps at all, what could this be have any of yall had this problem

 

How wierd.....I just talked to a co-worker that has the SAME TRUCK with the SAME PROBLEM, and the SAME NEW PARTS....I told him it could be a dirty MAF or possibly a plug wire disconnected from a coil......

This is just too freaky !!!

 

I'm having the same problem and I have an 05'. Do you still have the power thru-out the powerband? I cleaned my MAF and that didn't help. But with your mileage, it won't hurt to clean it.

 

yes the hesitation at first is the only indication that there is something wrong