Help! Having problems with 96 Maxima burning coils.

[used parts]

Okay so i have a 96 Maxima 5 speed SE. I drove it 4,000 miles with no problems. One day car starts misfiring, ended up being a coil(#4). I replaced it with another(used) that i had......40 miles later same thing. I replaced it with another used.....40 miles later same thing. I replaced it with another used coil and drove it 1100 miles with no problmes and then same thing.....this time #4 and #1 went bad......i put 2 brand new nIssan coils and 1 mile later......same thing. I swapped out the ecu and put 2 more used coils in. Went 500 miles and yesterday the whole rear bank #1#3#5 of coils burnt out. I'm pretty sure that everytime i have problems it was the warmer days of the summer hot/humid. Anyone encounter this? The plugs are new Nissan and other than burning coils it runs great. 140,000 miles