Use some good grade radiator hose to attach to the party fogger (the nozzles get hot) then a step down bit to force it into a smaller vac line sized hose. You'll want to attach it to manifold vacuum somewhere along the intake after the throttle plate.
Start the fogger look for any smoke leaking out of the system. It there isn't any, open the throttle plate and it will fill the intake lines and you can check those as well. If smoke only comes out the front of the airbox you have a tight leak free system. If not, fix it till it is and you know you got everything so then you can start looking at sensors etc. Cheapest why to find out whats what.