ONYX, the # is 1802903 and tell them your car is missfireing at 53 to 5300 rpm, they will ask what is it doing . answer the eng stops running for a split second then run again, and the TSB 1802903 replaces the pcm to correct that. if you can't find this and need a copy, i will fax or maybe e-mail (if i can scan it) i will send you a copy.
amx1397@aol.com