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Tuesday, October 20, 2009

I have a `99 Chevy S-10 4.3X with a P0300 code

I have a `99 Chevy S-10 4.3X with a P0300 code. Multiple cylinder misfire. Also a P0171 and P0174 - system too lean banks 1 and 2. I`ve tried to fix the misfire problem with no luck. New plugs, wires, Distributor cap and rotor, coil and control module. Engine does miss but is drivable. The other two codes I have no idea what to look for. What can I do to fix these problems.

A P0300 OBD DTC code indicates a random or multiple misfire.
•Faulty spark plugs or wires
•Faulty coil (pack)


  1. Im haveing a very similar problem with a yukon xl was wondering if you have figured out the problem

  2. Its not the fuel pump its not the filter its not injectors nor is it the o2 sensors... i've herd it could be the map sensor this is located on the throttle body or the maf sensor located after the air breather. was wondering if you have figured out what was wrong with your truck and if you could help me out cause i've tried all this shit and nothing seams to work. i cleand the mentiond sensors and it ran alright then went back to complete crap.. GMC eh Garbage made carefuly.