how new are your wires, is it actually sparking or is it just glowing when you touch it, the reason I ask is because when you put the MSD back on it might be producing too much power for you plugs to hold and could be grounding it self out even more then stock voltage, I would upgrade the wires to 9mm taylors to be sure it isn't arching, or you could check you plugs for cracking if the porcelain is cracked it will make the car run horrible and you might even hear a ticking from arching, somtimes you can't even see the crack in the spark plug, so if you've ever dropped one or just want to replace plugs do it. sorry if you already posted it up that you replaced all those things, oh and when you touch the wire, it's just the electrons movin around that's what makes it glow, if you can't feel it shock you your fine, but if your runnin stock wires upgrade them, same with plugs if it's been a while