QuestionMy 73 Bronco with 302 and c4 (all stock) runs fine cold then, when warm, runs rough and stalls in gear. I have done carb, fuel pump, wires, plugs, cap, rotor, coil, c4 vac module, and checked for vacuum leak with propane and starting fluid. Thoughts?
AnswerCheck the EGR (exhaust gas recirculating vale). It is on the intake manifold and the pintle in the valve that is supposed to seal the passage between the intake manifold and the exhaust manifold will leak and really upset the idle and low speed operation. The car will run fine at speeds above idle because the carburetor is tailored to run with the valve open at those speeds.
