Thanks for the help. I'm lost trying to help my dad with his 84'. It will run great for a couple of min, then won't start again for hours. I think it's something electronic and heat/temp related. I was hoping it was the ignition control module but I guess not. Here is what he's changed so far:
Oxegen sensor- distributor cap- rotor- plugs- wires- coolant temp switch- coolant sensor - map sensor- fuel pump relay- idle air contal valves- ignition control module- fuel pump and sending unit - fuel filter - cleaned egr valve- cleaned exhaust rail check valves- fuel canister check valve chech valve at distributor
Oxegen sensor- distributor cap- rotor- plugs- wires- coolant temp switch- coolant sensor - map sensor- fuel pump relay- idle air contal valves- ignition control module- fuel pump and sending unit - fuel filter - cleaned egr valve- cleaned exhaust rail check valves- fuel canister check valve chech valve at distributor