i have a yukon 1997 that was missing so i hooked it up to oreileys machine and it said multiple misfires, so i changed plugs and plugwires and it still was missing and finally wont start what do i nee
P0300 GMC - Cylinder Misfire Detected Random Cylinders.... *Possible causes Faulty spark plug (s) Faulty ignition coil (s) Clogged or faulty fuel injector (s) Intake air leak Fuel injectors harness is open or shorted Fuel Injectors circuit poor electrical connection Ignition coils harness is open or shorted Ignition coils circuit poor electrical connection Insufficient cylinders compression Incorrect fuel pressure... The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persist more tests needs to be done to diagnose problem.
Check fuel pressure with a manual gauge
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