BOTTLEDZ28
I'm Awesome
Sounds like a misfire to me, my truck does it too. After it unlocks, it needs to see the misfire count stay under a certain threshold for a certain amount of time before it decides it will lock the TCC again. Drives me nuts. Always happens at light load cruise, moderate load it won't do it. It will also misfire at WOT in 2nd and flash the MIL, but no MIL for the light load misfire.
You must be getting some serious misfire counts if the ECM is flashing the light at you. Im not sure how fast those OBD bluetooth scanners work but I use Dash Command and while cruising, it will only pick up about 8-10 misfires on cyl 3 and thats over a 5-10 mile ride at various engine loads. I have never got a light for a misfire at all. I also am not getting any other lights.
I guess I would have to be logging data when the converter unlocks and see if its picking up misfires counts at the same time.
FWIW, I watched the tach needle this morning as the trans when through the gears and I did notice that as soon as it shifted into 4th, the tach needle fluttered a bit between 100rpm. It did that for a second and stopped. Then, a few seconds later, the converter unlocked and stayed unlock until I could slow down enough to get the trans to downshift and then go back into 4th.