Ford: 97 Tbird LX, excessive vibration, plug holes

Question
I know I have an intake manifold leaking coolant, however there is an excessive vibration from the engine. I cant tell if it's trying to bog down ow it almost feels like bad motor mounts? could it be related to my intake leak? The problem occurs at idle and upon heavy throttle, when im barely on the throttle it doesnt seem to be a problem. clogged fuel filter? injectors?

Answer
Provided you have a 4.6 car... This is absolutley caused by the intake... (I just purchased a 97 thunderbird from a customer who did not want to put an intake on it... ) in my instance (I can't tell without looking at your car )the coolant was leaking from the intake into the spark pluf holes adn filling the spark plug holes with coolant and grounding out the spark.. if you look on ebay the intakes for your car are verry inexpensave... (Like 200.00 shipped... between plugs, wires, and an intake I spent $300.00 fixing my t-bird and it purrs like a kitten. if you decide to do the intake job let me know... I'll e-mail you the process...