[DanEC]

You might check continuity of your rotor from center contact to rotor tip. I never heard of this until the other day but I read where someone found a rotor that was very high resistance between the two - should be near zero.

Hard to see how a coil could cause your problem - it feeds the cap but doesn't have any way of knowing which cylinder is next in line to fire.

I can't see how you can even get the motor to run on two cylinders (?) That sounds unlikely - more likely would be most cylinders are firing but getting a weak spark. Did you use your timing light to check each cylinder to see if it flashed, indicating power to the wire? Since you have had the plug wires off and on so many times I would check each one out for resistance and while checking them be sure to move the wire around at the plug boot. Some types of wires/connectors can be damaged pretty easily at the plug boots. Also push the plug boot back if you can and make sure the terminal is still securely crimped to the wire.