Hey all,

Fighting this idle issue with my 93 LT1. When the car is warm in closed loop only do I get a rough idle for a few seconds and then it disappears and idles fine. Okay, no codes, starting to think O2 sensors. I had this happen on an Obd2 PCM on a different vehicle. It would idle rough in closed loop then everything would be fine in about 10-15 seconds. I did replace the single O2 in that vehicle and the problem went away. Never does this happen when I first start up the vette when it's cold, it idles perfect and runs perfect after that. So, what do you guys think? Also, your favorite O2's bosch, NTK's? Thanks for any input.