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
With the new fuel injected engine and improved ignition systems you should be able to go 100,000 before tune-up
Check the coil or coil packs if equipped.
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.
ac delco spark plugs are type that originally came with 2003 GMC envoy
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A 2003 Chevy Suburban will crank but not start if it has no spark or fuel. Checking for a clogged fuel filter or fouled spark plugs can help to resolve the problem.
The factory spark plug gap is .050 w/ delco plugs
8 spark plugs
4 Spark plugs
2002 galant , can't find the spark plugs
A/C Delco #41-103, these will idle better than other brands. Also good, NGK, or Denso, stay away from Bosch, and any platinum plugs.
ALL gasoline engines have spark plugs. Only diesels don't have spark plugs.
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No spark plugs on a diesel