car dont idle

[idiot goes sideways]

the lines are fine, and i run a aftermarket intercooler but drove this one with my stock engine ago so it should be okay

anyway if there would be air leaking in, the car would rev up alone and that doesn`t happend if i go of the throttle it stall`s................maybe i`m wrong

but i check for leaks, just in case,
any other ideas??