misfire on #3 and #4 cylinder i replace ignition coils and spark plugs i check compression #3 185psi #4 190psi when i check for pulse at #3 fuel injector the noid light flash stop and flash while engine running what is causing theses problem? the engine codes are p0300, p0303 and p0304.
May 29, 2026 at 2:25 AM