4.3 vortec miss firing badly
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
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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