05 Silverado Crew Cab 5.3 - Started truck and ran rough. The CEL started flashing so I shut it off. Waited and then started it again this time ran fine and no light. Pulled codes and got p0200 and p0300. Any help will be appreciated.

 

Really disappointed that I'm not getting any help.

 

P0300
Cylinder Misfire Detected Random Cylinders
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
Possible causes
- 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

P0200 - Injector Circuit Malfunction


Possible causes
- Fuel Injector harness is open or shorted
- Fuel injector circuit poor electrical connection
- Faulty fuel injector
- Faulty Engine Control Module (ECM)