So I was having a problem with the lock up on my 91 benneville, there was no shuddering or anything, it would just constantly shift in and out, or sometimes just not lock up at all. Was getting a high voltage code from the tps, which is involved in the control circuit for the tcc, so I replaced and adjusted tps and so far so good, fingers crossed.

That was most likely the problem.

Good to hear you got it.

still getting a code but now for low voltage, according to mitchell it should be 0.33 volts at idle, im reading 0.34, kinda strange, but is definitely shifting better, so ill just put up with the intermittent engine light for now, was a used part, maybe ill purchase a new one.