Hey everyone,

I'm having a difficult time trying to figure out this idle issue. Its a 2011 G37 Sedan XS it has 3in intakes, long tube headers, and a catback exhaust, oil catchcans,tuned. The car cant relearn idle. Ive tried the pedal dance a couple dozen times and have also tried doing ecuteks relearn as well with no luck I have also done all the necessary steps to do each of these relearn procedures. It seems like it wants to idle when on cold start but after it warms up the idle raises to around 1500 rpm. After driving the car and then putting it on park the car begins to surge up 2500 before dying. Also when the car is at operating temperature and driving when going around 20 mph and having no gas applied it begins to surge as well. Only error code is high idle code P0507.

Thank you and any ideas or tests i should do would

 

Some ideas are a vacuum leak in the intake system at some point after the MAF sensors or a malfunctioning or dirty throttle body.

 

I have replaced the throttle bodies as well as preformed a smoke test to see if there are any leaks at all and there are not