Check the coil or coil packs if equipped.
Chat with our AI personalities
With the new fuel injected engine and improved ignition systems you should be able to go 100,000 before tune-up
the proper gap size for all vin. #'s of 2003 Chevy and gmc suburbans is 0.060 as per the Chevy owners manual. I have a 2003 Chevy suburban and I am replacing my plugs tomorrow, good day kind friend. Danny Romero Louisiana
Have you tried having the wheels balanced ?
if you have the 2.2 liter ecotec engine, they are located right on top of the engine, they are located under the top black piece that says ecotec on it.
If there is no trouble while shifting, then the problem most likely is with the ignition sequence. This could be caused by bad gasoline, a bad timing assembly or faulty spark plugs/wires.