I need some help please... I bought a 1993 Grand Prix with a 3.1. with a major problem. I got it to drive back and forth to work because I heard they were reliable. I've had it for a few months now and then this started happening. If I'm driving down the road it sputters, the tach jumps around alot and it dies. I thought it was the crank sensor so that's where I started. it didn't fix the problem. So I thought I'd try plugs and wires, that didn't help either. I took my coil packs and ign. mod. in to get them tested and they tested fine. My battery was weak, so I replaced my battery and the neg. battery cable because it was frayed. Next was the fuel filter that didn't fix the problem either. I took it to the local GM dealership and they couldn't track down the problem. I'm running out of options at this point. Is it the computer? Is there any way to test it? Any other suggestions? I have been screwing with this for a month and I don't know what to do with it