4 Answers

dude, its ur distributor or spark plug wires....a miss or un burnt fuel aint causing poor spark, they are the result of poor spark....

its either ur distributor or the wires them selves.

check dist. cap and rotor, points,timing,espcially coil,

Ahh! A chevy man. make sure they are the correct size plugs and correct gap approx. .030 same with points .030 adjust if necessary.replace cap,  rotor and condenser(primary to reduce static on in dash radio) coils were cheap back then so, I replace it. New sparkplug wires don't forget to set the timing. Put your strobe on TDC on number 1 piston and a good starting point might be 12 degrees BTDC If you cannot get it in time remove hold down bolt under distributor cap lift up distributor out enough to reset rotor pointing physically at the number 1 piston at TDC again attach strobe and adjust to 12 degrees BTDC or to your liking of performance. Good Luck and thanks for the memories.If you don't have a .030 feeler guage if you have a old book of matches that folded over the top of the individual matches themselves the cardboard striker on the front if torn will work just fine and the abrasive used to strike a match is a good cleaner for plugs and points.Don't forget to replace the coil tower to distributor tower wire should come with plug wires or with coil.If the plugs are oily it could be rings or valve guides