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Discussion Starter · #1 ·
Hi. Swapped coil & plug wire. Code still with #4. #4 plug looked questionable. Changed plugs. Code still there. If this issue is listed elsewhere on the forum, I apologize. I could not find it. Any help is appreciated. There seems to be a number of possibilities (here, you tube, etc) and trying to narrow it down. Thank you for any help.
 

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Discussion Starter · #3 ·
Ok. I took a chance and ordered a new injector. I figured that was all that was left. No luck. New plugs, ignition coil, plug wire & now injector. Still brings up stabilitrak & traction control on the display and p0304 on the reader. Any ideas? I am at my wits end.
 

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2000 Silverado Z71 4x4 5.3L 480k+ miles w/ GM rebuilt motor and trans
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Swap the injector around to verify a good new injector.

Next I think is a compression test on cylinder 4.
 
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