have you checked all of your spark plugs?when i first had my supra(before i swapped in a 1jz)it had a 7m-ge engine,one day it started doing exactly what you describe,i was inexperienced at the time and didn't even hesitate to take it to my buddies shop.he discovered a badly damaged spark plug,meaning that the engine had basically been firing on only five cylinders instead of six making the engine chugg,check the plugs(i know most are under the throttle dody, wack place)if it is desrtoyed replace it and see what happens.make sure to check all of the pugs.if this helps let me know.if pluggs are routinely breaking something very bad is afoot.
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