I have owned an '87 GN for about 3 years now and not had any problems with the B. Hofer built transmission. Went to the track a couple of weeks ago for test n' tune. Only two passes were made. Hit the street to come home and the tranny will not upshift unless getting off the accelerator, and at an increased RPM engine speed. I adjusted the TV cable per procdure with no results. I've read there may be some trash in the valve body. Can anyone suggest other things for me to check before I take the car to someone to pull the transmission? I would most likely have it sent to Vince Janis. Thank you for any suggestions you may give.