vibration when hot

I seem to have a vibration issue when my car gets heat soaked. The car idles rougher, and there is what feels like a miss +2500 which gets worse the higher the car revs. When the car is heat soaked you can rev it at idle and it the car isn't as smooth either. No applicable codes stored, all msd stuff. Etc and iat is good (resistance check)

I'm thinking ignition but what about the tune? It is apparent when I drive to the gym and let it sit for an hour and come back out to start it. Starts fine just seems to not run as nice.

Drew

did a cylinder balance test and it passed all three times. do these 302's have some harmonic issue at 2500? I have a tubular k member (AJE) where there is hardly a motor mount. Maybe i'm just feeling excess vibration from the k member. my trans mount and crossmember bushing are brand new.

ok guys I popped my hood tonight and found that my msd coil was acring from the body to the winding around it (3 oclock and 9 o clock) I'm thinking this has something to do with the miss I'm feeling. I replaced it with a known good msd coil and also a stocker and it does the same thing. I have msd wires and I checked the ground resistance from the coil bracket to battery. Could I have a cracked plug with would cause the extra voltage to blow out the side of the coil? I didn't see any arcing from the coil wires/plug area...

Ideas?

thanks,

Drew

just checked the resistance of my msd 8.5 wires and found that my number 7 had a resistance of 2500ohms haha. I rechecked it about half a dozen times thinking my connection was bad. MSD says 40-50 ohms per foot so this was pretty bad. Good news is that I straightened out the spark plug side boot and the resistance stayed a steady 120ohms which is acceptable. I had angled the boot some to accomodate the number 7 plug angle and I guess it didn't like it. I made sure that the resistance was not succeptable to change from the plug wire moving around. I'll let you guys know how the car runs tomorrow.

Drew