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I have a 99 tahoe with a 5.7 vortec that missfires on #4 cyl. Under heavy load (pulling a hill) I have replaced the fuel filter, air filter, cap, rotor, plugs and wires no change I also replaced #4 injector no change. I have sprayed the intake looking for a vacum leak no leak detected. I also checked the compression it's good. Anyone have any ideas where to go from here I do have access to a tech 2.
When it missfires bad I get a p300 random misfire codeRe: 99 TAHOE 5.7 VORTEC, CYL.