I have a 97 gt and its been leaking coolant for sometime now so about a week ago i put a brand new dorman intake manifold in to try and fix the problem it didnt what else should i be looking for as a cause for this

 

Confirm that the manifold is actually the sorce of the leak.

 

It cant be the manifold my dad says it might be a freeze plug in the back of the engine. I just was wondering if theres anything else that could cause a leak close to the back of the engine on the passengers side

 

Is it wet above or below the head?

 

possibly head/head gasket, theres also heater core lines there that can leak. or soft plug

 

Put down the wrench & stop guessing... Rent a radiator pressure tester from your local autoparts store, hook it up to the radiator when the motor is cold, pump it up to the same PSI listed on the radiator cap and listen for any hissing noises and look for any drips. Shouldn't be too hard to track down. Good luck...