Start with the easy/cheap stuff first.

The electrical connectors on the top of the inlet manifold can give issues. Disconnect and reconnect them a few times to clean the contact surfaces.

Next step would be to look at the idle air controller on the side of the manifold near the throttle body this may be stuck closed (most likely problem). On the vacuum line on the air filter side of the IAC you should be able to feel suction when the line is disconnected with your thumb over it, as you turn the engine over. No suction = IAC stuck.

Is it throwing any codes that you could retrieve?