Re: 2003 h2 with p300 code
which cylinders are misfiring? if its 7 or 8 could be water in the fuel rail. Could be a bad injector. \if all cylinders on one bank are missing could be a restricted catalytic converter. Could be a plugged injector due to contamination in the fuel system. Could be intake gaskets leaking.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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