Would the car spiking to 15-16psi mess up the coil packs or spark plugs? I looked at them when i had them out when I was changing the plugs and they looked fine. Where can you purchase them from? I hopped on ebay and google and couldnt find anything recent/relevant.

 

lol read my "1jzgte issues" and you will see that i had the same issue I went thru the same crap it's not the coils not the plugs.
I am 100% positive it's your ECu, thy finding someone local and swap Ecu with them before spending some money on the coils and i am sure it's not the coils nor the plugs.