ok, i have been running the 93 octane from road ranger for a wile, now i used the premium 93 from the bp gs station and when i let it idle down in gear it backfired alot, even when 4k it backfires, not horribole laud but snapping in exhaust what can it be ??


my setup is all motor d16a6 block with zc pistons and shaved head etc z6 head blah blah.