1990 Chevy Truck small mis

Engine Performance problem
1990 Chevy Truck V8 Two Wheel Drive Automatic

i have a small mis when idling in park & when I put in drive smooth out, but when I take off there come's the mis again. I change plugs & wires rotor check compression ok about 12000 miles on eng. Just started after I change trans. Had been sitting up about 4 months. Change idle air selnoid was broken tried carb. Cleaner on vaacum hose thinking map sensor but still starts coolant temp. Sensor something not right can some one help.