saifi450

Hey guys, so after searching with no luck, I thought I'd post. So I have a s13 5speed with an auto ECU, ever since I've had the car I've had idle problems (too high, too low, bogging out). So I replaced the IACV and it seems to be working fine, adjusted idle to around 750. But when I disconnect the TPS, the idle shoots up to like 2000 and I can't drop it. My idle is fine with the TPS connected, but I wanted to see if there was something I could do to fix it. Also my idle hangs at around 1500 when I let off the gas, than drops a few seconds later. I had my mechanic check the timing and he said it was fine. Any help is much appreciated, thanks!