major idle problem..help!
 

so i have a 93 v6 and every time i push the clutch in while driving or coming to a stop the idle wont catch @ 750-1000rpm on its way back down. instead it starts fluttering between 100-450 for maybe 5-10sec without dying and then bumps itself back to normal idle. when i jump the terminals the timing doesnt change at all. i checked the ecu for codes and the only code that pops up is a tps sensor circuit. ive changed the tps and adjusted it properly. i even had it adjusted again by a shop and the same thing keeps happening. i need serious help on what this could be. thanks for your time.

no thoughts huh?