2006 Pontiac Grand Prix misfire
I recently just bought the Grand Prix it’s a 3.8L
supercharged an it’s has a misfire I hooked it up to
a scan tool an it read P0304 which is a misfire in
cylinder 4. The car has a hard time starting also it
cranks over my battery is reading at 14.0v it’s just
cranks until I press the gas while turning the key it
really only does this when warm when it’s cold it
starts right up most the time. I replaced the spark
plugs an wires I changed the ignition coil for
cylinder 4. I also hooked up a compression gauge
an that cylinder is only reading 50 when normally at
75 any suggestions?
