if they have no outer visable damage then anywhere from 60,000 to 100,000 miles
the wires from the ignition switch need to be replaced.
maybe ignition modual
are the wires good? Plugs?
CHECK THE IGNITION SWITCH,,, THEY HAVE A HABIT OF GOING BAD
check that your sparkplugs are not cracked and that your wires are fully on your plugs
Assuming it is getting fuel and you have no spark, replace the ignition module.
is it a new column or used. if all the wires are connected check the ignition switch. not the ignition key part but the module
Sounds like the ignition switch.
check and see if u have a hole in your muffler
did you replaced spark plug also distributor cap and rotor???
Assuming the plugs and wires have already been replaced you may have a bad fuel injector.
Exactly the same thing that would cause an ignition miss in any other engine. The question becomes, "how do you know that it's an ignition miss as opposed to a possible burned valve?" If you're certain it's caused by ignition, check the plugs, cap, wires and the ignition pickup assembly. have replaced HEI coil button in cap module plugs wires and new carb still have high rpm popping?