94 z34 auto, check engine light comes on , trans only has 2,3 and reverse, i get low volt code for tps, a.c. does not work , it tends to do this more when car is cold. may only do this for a few miles , turn off car start back and ever thing is normal , i am sure trans , a/c and tps all get power from same wire from computer, just alot of things to rule out i just wonder if anyone else has had this problem.