Check engine light comes on vehicle idles rough.Code reader says po131,po300,po1133. I changed the oxygen sensor on the passenger side no difference thought maybe bad gas. I bought a fuel filter and some spark plugs. When I changed the plugs the driver side plugs were black and the passenger side were white. Could this be the pressure regulator or am I looking in the wrong place? Could this be a vacuum line?
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I have a 2004 Gmc yukon xl po1133 & po0134 service codes , change plugs wires & fuel filter also ran tank of castle fire ball plus fuel treatment. Bank 1 spark plugs black & bank 2 plugs normal , after spark plugs were changed vehicle know runs great ,but engine light keeps coming on for oxygen sensors bank1 S1 & bank2 S2 .
I have replaced the crank shaft position sensor, replaced the spark plugs and replaced the coils and getting a P0300 code multiple misfires. I have also notice that the driver side vents are blowing hot is this indicating that it maybe a vacuum leak somewhere?
Cannot change passenger side rear spark plug
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