good ignition module?

I think I've got a bad orange box on my 440...hard to get idle dialed in, won't idle in drive....runs ok up to about 4500 - 4800 then everything just goes south....NASTY misfiring....my first thought was starving for fuel...changed the fuel pump...then thought the carb might be bad (only a year old)...so I borrowed another new out the box carb from a friend...car performs exactly the same with second carb and new fuel pump. Admittedly I'm not a master mechanic. lol

Would a bad orange box cause the car to idle like crap...then run good up to 4500?