Cuts out under load. 78 chevy pickup. 1/2 ton 4X4. 350 engine. Idles perfect, starts right up. When you get on the gas hard, it sputters and cuts out. New spark plugs and wires, fuel pump and filter.
Some things you can check. First, with the engine off, look down into the carburetor and quickly move the throttle. You should see a squirt of fuel. If not, the accelerator pump is bad. If that is OK, check the spark itself. It should bridge a half inch gap with no problem and should be healthy (have good "snap" and bluish color). If OK, check the two wires that run from the ignition module inside the distributor, down under the breaker plate.Often those wires can partially break or short to the housing...when the advance moves the plate it will cause a problem.
Only other thing I can think of is timing. That engine likes from 8 to 12 degrees advance (depends on fuel quality) if it's set wrong it can make it fall on it's face when you floor it. (bad chain can do that too).
Jun 22, 2010 |
1978 Chevrolet C1500