Been playing with my 2005 Nissan Frontier 2.5L (engine is QR25DE) with a 5spd transmission and 180k miles. Dealing with P0507. Idles around 1500 RPM, then when it gets good and warm (minimum 20m driving), the idle will surge from 1500 to 2000, then back to 1500, then back to 2000...
Stuff I've...