2003 Chevrolet S10 Q&A

2003 Chevrolet S10 Question: i have code p0304, how to fix it ?

i had good compression, good spark. i replaced : new ignition coils spark plugs and wires -
Answer 1
Check for a vaccum leak near # 4 cyl. Check for injector pulse and fuel also. IF you have all that stuff you stated. How much compression did you get (psi) ? -
Answer 2
sounds like an inj issue or pulse signal at inj. -