Ok guys I have 2005 infiniti g35 coupe base model it has a 1/4 inch plenum spacer. A chrome plenum cover and a nwp 75mm throttle body with a furookie intake and a full tdx2 motordyne exhaust with art pipes. When I changed all these factory parts and put aftermarket parts on the session light came on. That was no problem I just did the ecu reset along with the idle reset.it turned off. My car high idles and in automatic or slap stick it doesn't shift right it builds rpms to like 4 grand and the shifts out mostly in 2nd and third. I have no clue on what to do.

 

Check for vacuum leaks and loose fittings, corrosion in the electrical system, real-time scan OBD2 data, if all else fails there is likely a Nissan dealership in town to do the diagnostic.

 

Put the original OEM parts back & see if the trouble clears.

Perhaps you purchased defective aftermarket parts or did a improper installation?

Telcoman