1997 Pontiac Firebird engine light on and code.what do I do

1997 PONTIAC FIREBIRD
110,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CONSTANTINEKORRAS
  • MEMBER
  • 4 POSTS
when I accelorate it sputters but not all the time.

code # p0304

its sais that the PCM has determined that a misfire has occured in cylinder #4

?OEM brand:domestic?

probable causes:
1.Ignition system ,wires,coil,
2.vacuum leak
3.injector fault
4.high or low feul pressure

what do do next?Please help.
May 1, 2008 at 8:46 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
how long ago was the lasrt tune up? Always go with the basics, youll have to check em anyway! To check for vacuum leaks:get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!
https://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
Check #4 this way!
May 1, 2008 at 9:04 AM
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