I have a problem with my 2004 G35x, the car would not start again after I had driven the car or when the engine is warm. The only way for me to start the car is to let the engine cool down or turn the key to ignition and starting it and then step on the gas pedal. Car have 56K miles. Please Help with info.

Mod:
UR Crank Pulley
Stillen Exhaust
Stillen Intake and Z-tube
Hyper Ground wire system
Hyper Voltage System - Voltage Stabilizer
Denso Iridium Spark Plugs

Thank You:

check vacuum lines. Any rubber hose that isnt connected could be causing the problem.

all the vacuum lines are conneceted.