I just completed my LS/VTEC conversion and faced with the following problem:
When engine goes idle initially stops on 1.500 RPM, and them after 1-2 sec. drops to 800-900 RPM and stay stable on this level.

Problem is that this effect very effectively disturbs VTEC, because computer lights up error codes and forces engine to use "safety mode" and car stalls.

Do you have any ide what I should do to get rid of this problem.
My setup is:

'94 LS teg OBD-1
B18B1 OBD-1 block
B16A1 OBD-0 head
P30 - OBD-1 ECU
Harness modification