Not a 4 eye, but I'm hoping someone can help . I got a 89 tbird base model from a friend. 98k. It runs and idles rough. But it drives pretty well. It runs very rough, especially when you start it. My friend had changed all the ignition. Except the tfi and pip. When I pulled the plugs, all of them looked richer than they should be. Definitely darker than optimal for fuel injection. The back ds one was almost black. I swapped them out and it runs better. I also checked the line to the fuel pressure regulator. It seemed dry. I also think he changed the o2s, but I'm not sure. A quick compression check shows that all cylinders are equal, near 160 lbs.
I'm thinking about changing the fp and the injectors. But I don't want to throw money at it, unnecessarily.
Does anyone have any experience on 3.8s, that can give me some advice. It's a nice car. The rough running engine is really it's only problem.
Thanks
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