problems from losing/dropping power, eratic upshifting,rear brakes engaging

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i am having eratic issues every time i drive. loss of power, eratic upshifting, dumping way too much fuel, backfiring, to rear breaks randomly engaging while driving and almost locking. If i clear the check engine light codes, it drives fine for anywhere from10-20 miles, then any of the previous happen again. Codes such as multiple misfires to bank2 fuel rich to abs .. they are never the same.. leads me to think the ecm is base cause.. sending improper signals for these to happen.. getting 126miles a TANK, but the random rear brake lock out of the blue to loss of power as if bogged down, to eratic upshifts are all seperate issues.. it has an electronic throttle body control unit which sticks at times but now i am wondering if the ecm is the cause... i have an 04.. can you tell me if any other year ecm or perhaps an 04 honda passport ecm would be compatible and/or in fact possible cause? I am a mechanic by trade, never seen anything quite like these.. snapon codereader explains each thing individually, but nothing tells me other than my gut that its all related to ecm and/or wiring harness.. any thoughts at all are needed asap