Idle issues/torque converter unlocking

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Five0786

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Did a short search online, didn’t come up with anything too helpful. I have a ‘92 half ton with the original 350 TBI. Been battling a random hight/low idle. Was driving home from work after the truck was running fine. CEL flashed, torque converter unlocked, and when I came to a stop, idle in gear was around 1000-1200. Throttle body has been rebuilt twice, IAC and TPS are new. It doesn’t happen every time i drive it, and Doesn’t seem to matter if it’s cold or hot. Any ideas?
 

PlayingWithTBI

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Since the SES light flashed, did you check for codes? A scan tool will help with this plus, it'll tell you what's going on with your sensors and ECM.
 
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