Hello all, I just picked up a project car over the weekend and I was hoping I may get some great advice on here like I have in the past.
Like the title says, it is an 89 Cutlass Supreme, and the motor has been swapped out. Originally the car had a 2.8l v6 installed, but the owner I just purchased it from replaced it with a 3.1l because the original motor had died. In addition to changing the motor he got a new computer out of a Pontiac Grand Prix that had a 3.1l engine in it. The car does start and will run, but not very well at all. It spits and sputters a lot, and if you just let it sit there and run, usually within about 5min, the motor just shuts off. What I need is a place to start looking to get this running right. Could the computer not be the right one, and make the engine run badly, or could it be they just hooked a bunch of stuff up worng? I would like to get it running better before I rebuild the motor, to make sure it is even worth messing with.
Also, I drove the car home, barely, and I also noticed that the electronic guages don't all appear to be working right. The battery guage, the RPM guage, and the speedometer are all on, but not reading correctly. The car's speed is actually 15mph slower that the speedometer reads. Is this also related to the new computer that was put in the car? Should I find one of out a Cutlass, or does it matter?
Any help is greatly appreciated! I want to try to get this running right so I can use it as a daily driver to work, my astro van sucks too much gas these days. Thank you!