Mechanics

GT WITH ERROR CODE PO300

2003 Pontiac Grand Am • 51,000 miles

I have an 03 Grand Am with 51k miles that is giving an error code of PO300, random cylinder misfire. Changed plugs, plug wires, coil packs, and fuel injectors. What would be the next and easiest thing to try/change?
AD
Avatar
Samantha1122
September 3, 2011.




Check the engine compression and fuel pressure.

Ensure exhaust is not restricted.

KHLow2008
Sep 3, 2011.


AD