4.3vortec Missffire

By 1996gmc
October 16, 2009 in Ask A GM Technician

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1996gmc

Posted October 16, 2009

i have a 1996 gmc 4.3vortec has p0300 missfire ok well i have replaced the engine harness,the computer oh and the complete engine that i heard running and drove the vehicle before pulling motor this problem has been going on for almost a year like i said this problem was doing this before replacing the harness and motor please help

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