Missfire

[fredrikdberggren]

MIL is on all time and flashes sometimes. Flash and missfire comes at same time.Engine code P0300 whats wrong? RAM 1500 Hemi 5,7 2005 Sorry for bad english, i´m from Sweden.

 

[Lugnutz]

Could be any of the following according to the code;
-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

 

[fredrikdberggren]

Okay thanks.
I will start with new sparkplugs. The truck has 9400 miles on it and I don't know when it was done last time ( or ever)

 

[Lugnutz]

New spark plugs can make a world of difference. Try running a couple tanks of gas with a fuel injector cleaner (small bottle from STP for around 8 bucks at most stores) is also a cheap way to start checking for problemed areas. Coil packs may as well be checked while you have them out for the spark plugs.