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My 2.8 mpfi is running really rich, like 3 miles per gallon(Expensive) and all 3 rear plugs are soaked with fuel. I changed them today hoping that after my head gasket replacement they might have been bad. The car starts(barely) and is driveable but will not idle. Also no black smoke. The oil and air cleaner smell like gas and they are new items also. ALSO no codes?? I disconnected sensors even the O2 and no codes?? ANY help or ideas is appreciated. its an 89 z24