I've got a LT1 T/A that I just got through doing heads/cam with pcmforless programming. It ran great for a while, but in the past 2 weeks the car won't shift out of first gear unless i'm at WOT. In normal driving it just stays in first. I dont think it's the trans. or it wouldn't shift at all. I did autotap it last week and I was throwing a TPS code. Changed that out and it did fine all week until today when I went to dyno. It started doing it again but didn't have a laptop to see if it was the TPS again. I was wondering what you guys thought this could be. Thanks in advance

Chad

 

I am also throwing a TPS low voltage code. I have replaced the sensor and i'm still throwing it. What would be causing this.