Were you able to get in-touch with Mark D'Sylva at EAT? Is there another version for CA cars? I have only very minor pining with the old 1995 Dinan chip and with the regular CA 91 octane gasoline and without any octane booster and my car has 90K miles. The EAT chip is supposed to work even better than the Dinan chip so I don't understand why you are having problem with your engine running with it.