My 2001 Ram (360) just started doing this exact same thing yesterday. Running just fine, then when stopping at intersection, the truck won't idle worth a crap. Then you can't get it to move again because no power, can't get engine speed up, backfiring like timing is off, engine just seems to be choking itself.

If I shut it down and restart, it seems to run fine again..... for awhile.

Also, no Check Engine lamp (MIL) and no code set on dash display. (Key ON/OFF three times quickly)