Strange Problem... PLEASE HELP ME....

I had my car programmed with ls1 edit by a perf shop in arlington. Now sometimes the car runs great, and sometimes the car will shift prematurely. For example, I will shift from 1 all the way through 4 th within 2secs and under 20? It will shift correctly under WOT, but partial throttle shifting works sometimes and sometimes it doesn't.

Another point. When the premature shifting begins.. within 5mins my car ses light comes on and when I check the codes it says both O2 sensors have low voltage, and throws a TPS error?

Can anyone help me?

Why would it run fine and then sometimes shift like this?

Thanks in advance, sorry for the long post.

 

Are you sure the TPS isn't screwed up, or that their isn't a break in the wiring going to it?

 

I'm not positive. I'm going to buy one this weekend and see if that helps.

 

Strange, it didn't help. The shifting began right after I had the pcm programmed with ls1 edit? Is there anything that ls1edit could do that would affect this? Is there a list somewhere of all the options ls1 edit has. I am taking the car to get reprogrammed this weekend and would like to know specifically what I can have the performance shop change.

Thanks