P0304 Code driving me crazy

[RHamill]

I'd replace both upstream sensors, because before you know it, the other that you didnt replace yet, will go. They are like $52.99 a piece.

The downstream don't affect how it runs, just gives a light.

 

[TruckinAin4Sissies]

Double check the dizzy, factory-style has a plastic base for the cap to screw down to, resulting in small cracks, allowing the cap to lift- missfire.

I upgraded to an MSD dizzy.