'91 buick,3 spd. 0 acceleration in 3rd, trouble code says TCC curcuit. Lopes @ idle when warm,runs rough @ times. many new sensors, timing chain & sprockets,still, the loping.

Look on the side of the transaxle and unplug the green electrical connector. That’s for the TCC. Take the vehicle for a drive and if the problem is gone, the TCC solenoid is sticking.