i had good compression, good spark. i replaced : new ignition coils spark plugs and wires
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2003 Chevrolet S10 Question: i have code p0304, how to fix it ?
Answer #1pushrod December 21, 2012, 00:13Master
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 #2Greg's Orange Auto (13188 Answers) , Orange, CA - (714) 361-9386globalhelper December 21, 2012, 06:09Master
sounds like an inj issue or pulse signal at inj.