I seem to have a little vacuum leak after my knock sensor replacement.runs fine,Idle is a little off.How can I find it???

Get a propane torch.(DO NOT LIGHT THE TORCH)Just open the valve to let propane out. Start the X and move the torch around the engine bay. When you run the propane near the leak it will suck in the propane and you should hear your idle increase. Hope it helps...

Aeresols work too...like carb cleaner.