Could it be a overheating coil..?

Can a overheating coil create unregular drops in fuel pressure or do I have multiple issues at work?

I've been having a stumble issue with my 360 which only happens when it is really hot outside.

Last night I took the car for a drive and on hard acceleration it suddenly bogged like it was getting no fuel, lay off the throttle and everything is fine. (car also doesn't feel as strong in hot weather).

First I thought it was some kind of vapor lock, but then yesterday I noticed my tachometer needle was erratic at idle (only lasted 30 seconds or so), which made me think something is wrong with the coil.

When I checked my fuel pressure at idle it read 5psi but then suddenly dropped down to 2 and then quickly came back up again.

Could all this be caused by a bad coil?
My coil is a chrome accel unit that pretty much sits on a bracket and rests on the intake, I can only assume that it gets pretty HOT :)