I own a 1982 Alfa Spider Veloce with 128k miles and I have run into a problem. I have always used premium grade gas for my car. Two weeks ago, on my way out of town, I accidently filled up my tank with 87 octane fuel . It ran through the tank with no issues (200 miles). When I filled up again with 93 octane last week, the car began to hesitate very sparaticly while driving. I let the car sit for a few hours, thinking the fuel filter had collected some sediment and it drove fine the rest of the week,,, until Friday. This is when my car died. It was constantly sputtering on my way to work that day and when I tried to start it to go home friday afternoon, it wouldnt start. I walked to AutoZone, purchased and installed a new fuel fillter and still no luck. In fact, the car only turned over, no sputter idle, nothing. I had to get it towed to my house. It sat all weekend and still just turning over. The tank is not new but it worked just fine before last weeks 87 octane blast. I am no mechanic and would love to hear from someone who might know what went wrong and what I can do to get my alfa back on the road.