Hello, I have a 70xr7 with a 351 c. a week ago it would not start and I found that the distributor was extremely loose. Once I got it started it felt like it was running on two cylinders. Once it got to operating temp. It smooth out and I timed it. The problem is that it still runs terrible unitl it reaches operating temp then it smooths out. Does anyone know what I can do to find and fix the issue?