93 nissan maxima se 3.0 v6

[nissanmax93]

HI i have had this problem for a while it started just a few days when i got car,only paid 700 dollars for it. i just rencently changed my spark plugs to ngk and now it idles rough. i tried to clean corrsion of sensor plugs,i used wd-40.also i smell gas from rear pass side of car but no leak, i cleaned TB, took of map sensor but i also dont know how to set it forward or more to the rear? also it started skipping today! i also added a cold air intake?HELP ME PLEASE

[loystock]

Welcome to NICO.

Changing the plugs should improve engine performance and not the other way around. Did you install the correct plugs? Are the connections good? Use contact cleaner and then dielectric grease for the connector.

The fuel pump and level sensor are accessible from the rear seat pax side. It's possible that the gasket is leaking or was not properly seated when a component was removed/replaced/inspected.