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Old 09-12-2011, 05:15 PM   #1
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Angry 1996 gmc yukon flashing p0300

First time GM Forum user.....very frustrated. 1996 GMC Yukon with flashing P0300 random cyl misfire code. Now in driveway up on blocks. Replaced, wires, plugs, rotor, cap, fuel pump, fuel filter, fuel pump relay. No change. Starts easy and runs but missing badly. MLI comes on after 30 seconds and starts flashing. I am debating next replacements. Ignition Coil, Crankshaft Position Sensor, Camshaft Position Sensor, Fuel Regulator, Complete Spider Injection module with new injectors, maybe computer??????? Need an expert opinion on where to go next please. THX
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Old 09-12-2011, 05:16 PM   #2
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Old 09-12-2011, 05:43 PM   #3
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Crankshaft position sensor would be a no start, not a misfire.

Fuel pressure regulator can be checked by removing the vacuum hose and smelling for gas. If you smell gas replace it.

Changing the coil is likely the next thing to try.

FWIW, I had a cheap scanner that was giving me a random misfire code. A better scanner showed it was actually one cylinder. How good is your scanner?
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