So my car went dead on the highway and after getting it home found it was the throttle body so that was replaced (and did pedal dances). After that having no luck I figured it was the cam sensors but still no luck, brought it to a mechanic and they said the fuel pump was bad so I changed that. I’m really stuck and not sure what it could be, thinking about checking for spark but not sure what my next step should be. -2006 G35 coupe Stock

 

Plug in an OBD2 scanner and check for codes. Just because the SES light is not on doesn't mean there aren't codes

Just out of curiosity, when you crank the engine is the red NATS Security LED Solid Red?