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The problem can be a loss of spark or fuel. You can check forspark at the plugs with a spark tester. Check compression too for apossible valve timing issue with a compression gauge.You can check fuel pressure with a gauge and all of these toolsshould be available to you at yourlocal parts store for rent or purchase.You need to check for any stored codes in the computer with acode reader or a scan tool.The code reader only gives the codes and definitions, where thescan tool gives you allthe needed data to diagnose the codes.Thanks, Ron
Both batteries need to be tested for specific gravity and load.
The ignition switch can also cause a loss of amps to the batteries.
The whole starting system needs to be voltage drop tested for anything that is excessive.
If you are satisfied with my answer, I would greatly appreciate a 5star rating now and I will still assist you after you have rated metoo if another question pops up. I don’t get credit for helping youuntil you rate me.Thanks again, Ron