where do i put stop leak

I do not recommend stop leak as it will clog small passages and may cause more harm. You put it in the radiator, be carefull not to open a hot system.

Using a quality stop leak (Blue Devil) will not plug anything up other than the leak. You most likely have a intake manifold leak. If you use Blue devil follow the instruction exactly.

I do agree with answer #1. I don't recommend stop leak, even if the manufacturers claims it otherwise, THEY DO CLOG COOLANT PASSAGES and could cause more damages. We see this quite often. Repair the leak correctly, that's the best way to do it. Zee