Have an IAT code, replaced the MAF/ IAT/ BAR, and still codes IAT.

Checked vacume, after engine warmed up, idle 700 rpm-vacume 15.5 steady needle. Ran poorly on cold start, kept rpm's at 2500 until warm, then it would idle on its own. Cleared P0110 IAT, drove 6miles on slight incline, engine would miss erratically under load, smooth down hill. rechecked codes-P0110 IAT, ran at idle-reset idle speed to 800 rpm, ran for 10 minutes at idle, THEN idle dropped, engine ran poorly, tried to accelerate, acted as if was running on 4 cyl, hard to rev up, won't hold idle-would die without throttle. This is repeatable- after car has run for 20 to 30 minutes and had been test driven for codes and performance check, would let idle- performance appeared normal, then as if something overheated or 'switched off', suspect partial electrical failure to engine controls, would drop idle and die if not reved up- and revs weak and not all cyls, would drop revs on own if held a 3000 rpm. Can restart and start process all over if car sits key off for hour or 2. Removed ECU and inspected for 'burn or hot spots' on grid- no visual signs of failure. Grounds at ECU good. Appears to have a partial failure issue on cold start, engine would run better warm, misses on load, then after 20 + minutes a performance control would break down to a full failure. Again new dist cap, rotor, wires, plugs, MAF unit (w/ bar. and IAT). Retired auto tech 40 years exp. and fustrated! 12-29-14 Tesed the IAT on a cold morning and as it warmed up and tested in 'normal' ranges as it warmed up. Tested TPS and again it tested normal at idle and thru full throttle position. Am going to test continuity on IAT wire to ECU, if good must suspect ECU to keep getting IAT code. Any other thoughts? Are you still there?