Irratic spark

[Bkilo]

89 carb festy spark is irratic bought new distributor timing looks good can ignition key cause ?

[WmWatt]

I'd whe ignition wires with a clean rag and crimp the ends to ensure good contact. I do ti 1-2 times a year. If you have a volt-ohm meter you can check the wires for proper resistance.

[Movin]

Haven't seen that in a while, no more than 5K ohms per foot of wire.
Put a test light on the IG side of the coil and see if the light stays steady
and bright.

[georgeb]

If you suspect the ign switch jiggle it while engine is running and listen for missing.