02 Accord 4door EX 6cylinder. I changed the timing belt and water pump, installed new plugs, new PVC valve, new air filter and changed the oil and filter. Buttoned it back up, it started immediately and sounded great. After it warmed up, the idle would pulse up and down with the AC compressor cycles, sometimes stalling. Never did before the work. It also set a 1399 (random misfire) code on the code reader. I reinstalled the old plugs, cleared the code, and it seemed better for a short time. Then it started again, only when the AC unit is cycling. If I turn off the unit, it runs like a champ. Also no return of the code............yet. (130 mi.) Any help will be greatly appreciated. Thanks!