hi alll i just installed a custom cat back exhaust system to my 2003 nissan 350z and also had to get a new transmission put in because the old one was going. after putting a new auto tranny and a custom cat back (stock muffler no resonator) my rpm has been really low im idling on 400rpm sometimes 500. sometimes when i turn on my car on a warm start up the rpm will drop to almost zero but it comes right back up. its like its about to stall but it doesn't it will come right back up. can SOMEONE PLEASE HELP ME
(NO CHECK ENGINE LIGHT IS ON AND I'VE BEEN DRIVING THE CAR FOR ABOUT 200 MILES ALREADY AFTER THE EXHAUST AND TRANNY)

 

reset the ecu

 

Welcome.

I assume the idle was fine before the new transmission? Then take it back to the transmission shop.

 

https://my350z.com/forum/6008226-post2.html

 

how do you reset the ecu? thanks

 

Here is a link for: ecu reset, Throttle pos learn, idle and air learning resets

http://www.technosquareinc.com/350reset.htm