sputtering 7mgte any help?!

[Androidrc]

i have a 90 7mgte with the basic bolt on running stock boost. my problem is, yesterday it started missing like it was running on 5 cylinders. It did this once before about a month ago but i parked it for the night and it ran great in the morning. NOTE: it's FREEEEEZING OUT here in central pennsylvania!! i pulled the wires off the coils one at a time to see if it made a difference. Odd thing is it almost stalled out when i removed each of the 6 wires which means they were ALL firing. I know what a car sounds like when its missing on one cylinder my Celica did the same thing and its wires were shorting out....and this sounds just like it. It started doing this only at full boost....and then only when you gave it gas.....and now it even does it at idle....im just confused and hoping someone more familiar with the 7m has maybe seen this and knows what to do. - thanks for any help o yea side note....already has HKS MHG and does NOT use coolant so i dont think it a BHG.