Poor Spark?

67dodgedartconv said
On my car with the same symptoms it turned out my original firewall to block ground wire was bad. The connections at both ends were clean and tight and the wire tested good for continuity. Ground wire from battery to block was new and both connections clean and tight. Replaced firewall ground and problem solved. It drove me nuts.

Now that you mention this. I don't think there is a ground wire from the firewall. I have one from the battery to the block. One from the ignition module to the battery. One from the block ground back to the frame and one to the Rad support. But none from the engine block to the firewall.

Could it be that ?