KA24 Timing/High Idle

[Karlitos]

So the car has been running alright. Except the idle is very high. It has a very stable idle at 2000rpm. No bouncing around, no sputtering, no nothing. I messed with the IACV screw (without unplugging the TPS, i didnt know) and i got idle down to 1500. I was still not happy so I did more searching, and decided to check timing. I had done timing not too long ago, again without disconnecting the TPS, and I had set it to 20* BTDC and it was still there.

So trying to do an Idle/Timing fix, i searched up to find that the TPS should be unplugged. Steps I did today:

1)Started the car, let it warm up.
2) Turn car off
3)Unplug TPS
4) Turn car on.
5) Set idle to 1500ish (its as low as the IACV screw would let me go)
6) Set timing to 20* BTDC (TPS off).
7) Turn car off.
8) Plug TPS back in
9)Restart car, idles at 900ish.
10) Rechecked timing with TPS and it went to 5*ATDC.

My question: Is this normal? Im kinda lost to why timing moved so much when plugging tps in. I had the TPS voltage checked not too long ago, and it checked out.