is the LTIT in the negative? if so, force it back to zero and see how it reacts.
how i forced my LTIT back to zero is i went into the scanner, while the engine is running, and lowered the timing with the VCM Controls. this forces the PCM to increase the IAC and add more airflow. i let it idle like this for about 2 minutes. once the LTIT got back to about zero, i shut the timing minus off.
another way i've read is some take the positive and negative battery cables, off the battery, and touch them together. this takes out the stored energy in the PCM and resets everything.