mil light on missfire all rpm what trouble to look for other than plugs has 75k on 2005 Chevrolet Trailblazer

no problems up to now

Asked by for the 2005 Chevrolet Trailblazer
Plug wires or boots open the hood at night or in the dark. Start the car and see if any spark is going out the side of the wires
Thanks, but this engine has the coils on top of plugs no plug wires.
yes they are also called boots. If you ck each one and make sure there are no "hot spots" or burn marks on the boot. you will not be able to see them arc