Join Date: Sep 2000
Location: Rowlett, TX USA
just finished my '69 Z28 - stock DZ302 w/Holley DZ Carb. Installed an MSD ready to run distributor, AC Delco plugs, gapped at .35. Timing is set at 8% TDC. Factory intake, Hooker Headers.
Car idles fine but when I "stomp" on the gas, it backfires through the carb. I can gradually up the gas and it runs great but tends to stumble, hesitate and backfire at times when I punch the gas. Any thoughts? Runs great at cruising speeds