the PCM is going to draw around a half to one amp with no other loads being placed on it, a 2-amp charger should do just fine as long as it doesn't have any kind of "pulse" mode. it should either taper off charge current near 14.4ish volts(temp dependant) or drop into a float mode and maintain 13.3ish volts(also temp dependant), either case is more than adequate for ensuring a safe flash.
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