My '93 SSEi after 'my' 5000 miles
 

Well, after putting 5000 miles on her, she's still running strong (total now 119,000 miles). The only problem I've had is the SES light, which is still on but the car still runs great. I've been running '89 Octane, fresh oil and Tranny fluid. Need to change out the SC fluid and maybe throw on a smaller pulley for kicks. Oh, I saw a Bonneville on sale the other day with 245,000 miles :shock: , hope mine makes it to there. These cars are crazy comfortable and ride awesome 8)

Use the procedure in Techinfo to extract your codes. All you need is a paperclip.

Quit using 89 octane. That may be part of your problem. Your car is designed to run 91 octane MINIMUM. Requirement, not reccomendation.