ac delco 904's
06-05-2008, 06:15 PM
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ac delco 904's whose running these plugs? i just took out my 1 year old TR55's for these again and the engine is idling way better!
i had a leftover stock plug from the LT install and wanted to change back to a different plug since im fouling TR55's out every 5000 miles. idle popping when hot from bad gas this time
i had a leftover stock plug from the LT install and wanted to change back to a different plug since im fouling TR55's out every 5000 miles. idle popping when hot from bad gas this time
06-05-2008, 08:50 PM
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I put Factory AC Delco's back in mine
Fouled out the #8 after 1 month
Runs good 8 months later
Fouled out the #8 after 1 month
Runs good 8 months later
Last edited by 1996firebirdformula; 06-05-2008 at 08:56 PM.