a buddy of mine and me both had that same problem when you unplug the mass air it runs fine but with it plugged in it will idle but act like it is running out of gas when you accelerate, it turned out to be our mass air sensors, both of them were bad, i had the same prob. on my 89lx, 95gt, and my buddies car is a 97gt, i would send that sensor back to pro-m, considering that both of the ones that i have had go bad have been pro-m's, HOPE THAT HELPS
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