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

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i had good compression, good spark. i replaced : new ignition coils spark plugs and wires
(2) Answers
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) ?
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