I just threw a P0758. It just happened sunday for the first time. It happened after I was idle for a while and went I went to pull off it felt like a surge and that I lost power. I had to rev it to about 2.5/3k before it would slowly go. It seemed to shift fine after I was off the line. Drove it the next day and it seemed fine, until the end of trip when it did the same thing. Again it started after I was idle for a little bit of time. Today I have been driving and it has not happened.

Is this wiring internal to the trans or external? I do have a 97 gt top swapped and still running the stock 4t60e trans. I am having the trans fluid and filter changed this friday.