Troubles with my 92 GMC 4.3 again

ok, let it set for a couple of days, went out and fired right up. Took it down the road a couple times taking it easy and it ran fine. Turned on the AC and cruised a little, ran fine. Left the ac on and flogged it a little, with peddle to the floor and downshift. Didn't miss a beat. When I first fired it up I noticed a CE light, pulled the codes, map sensor and 02 sensor. Unplugged the battery for a few minutes, fired it back up, no codes. This is with the new ECM. Haven't plugged the old ecm back in to see if that brings back the problems.