i just installed a 3500 stall and 3.73........and the mph and the rpm........are off.... the mph is about 10-20 mph faster than what it really is.....then i went to the dealership and they told me they can only reprogram up to 3.42......how can i reprogram it, since the dealer cant do it

 

What year is your car?

 

02 z

 

the rpm is not idling right....it sounds like its dying...my car dies sometimes on full stops, especially after it warms up....but once it get running it runs fine

 

I had a problem with my idle too after my TC install. In addition to the gear change I'd recommend increasing the idle a couple hundred RPM's.

 

does increasing the idle work and is it safe? im having the exact same problem.