codes

**x1078p** · 07-19-2009, 09:31 PM

i have a 2001 chevy tahoe with a po300 code ive changed the spark plugs and the wires and the coils are getting a good spark what else could i check

**bill190** · 07-19-2009, 10:15 PM

They have a web site just for this problem!

http://www.random-misfire.com

**Jimmiee** · 07-19-2009, 10:31 PM

If your ignition is all OK you may have a dirty injector. Have you ever cleaned your injectors or added any injector cleaner to the gas tank?

**J-wall** · 07-30-2009, 11:40 AM

I am dealing with that problem. I have changed the plugs, wires, air filter, fuel filter, fuel pump (stupid decision), and two coils - finally like a smart person I took it to the dealer for a diagnostic because the light kept staying on. They said it was a leak at the intake gasket, so I am in the process of changing that. Good luck.

Auto Zone only gave a PO300, I took it to a garage and they said it was on coils 1 & 3 and after that coil swap, it came on again and moved to coils 5 & 8, hence the trip[ to the dealer.

I have a 2004 Tahoe, 5.3 flex