4.3 vortec miss firing badly

Asked by Jan 02, 2017 at 08:29 PM

Question type: Maintenance & Repair

4.3 vortec missing really bad right before it
changes to 2nd and 3rd gear but when at
normal speed it still misses but not as bad
please help

1 Answer

75,525

Things to check, Possible causes - Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient cylinders compression - Incorrect fuel pressure which should be 56 to 63 lbs.

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