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

i had good compression, good spark. i replaced : new ignition coils spark plugs and wires

by in Vancouver, WA on December 20, 2012
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2 answers
ANSWER by , December 21, 2012
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 by , December 21, 2012
sounds like an inj issue or pulse signal at inj.