Quote:
Originally Posted by since.1978
I have a 04 trailblazer and it start to shake once started I replaced sparkplugs . I hade the truck looked at by on guy and he said I need a valve job then had my buddy check it out with a camera and he said I don't need one everything looks fine he's going to check out the fuel injecters. Any help would helpful thanks....
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Make sure he knows how to do proper testing.
Got any check engine lights on or flashing?
If so get codes and post back codes.
How many miles on it and what kind of plugs did you install?
Any cylinder misfires on it?