Late response: yes adjust the TPS. There's a phillips head screw on the lower end that locks it in place so loosen the screw, adjust then tighten and re-check. You need some patience and a long, side angle screw driver cause there's barely any finger room. I used a phillips bit jambed into a
1/4" box wrench with a bit of aluminum foil to keep it in place. If you have an excuse to pull the throttle body for cleaning it's real easy to calibrate it on the bench

'89 P'up, 2.6 I-Tec, 488,000 miles and done... gone to the great beyond