I'm still having problems with the 86,She lays down when under a load (going uphill) most of the time. Some time it runs good. I had the factory carb rebuilt and it still done it, I replaced the carb with a 78 Q-Jet. Still lays down.
I had the modual tested by two different stores,I replaced the plugs, wires, dist cap, rotor, I set the timing. The vacuum advance is working good. It has good fuel pressure. I doesn't pop or cough it just slows down no matter how much gas you give it or what gear you change to.
I'm starting to think the computer is bad.
1986 C-10 305-4 bbl/Th350 98K miles
Steve