Small Engines (Lawn Mowers, etc.): my 2000 dodge car shaking, blown head gasket, plymouth neon

Question
hi
i have Plymouth neon 2000 and recently it got overheated and i went to mechanic he fixed it and change the thermostat and coolant and he told me that i need to change the engine mount which i did and since then the car making noise and shaking every time i stopped i stop sign i can feel that shaking under my leg . i told the mechanic he sound like what wrong and told me give it sometimes because he just change the engine mount . another one says it is the breaks , third says that it is the catalytic converter fourth said that something is too tight that why it makes that noise and i got confused  and  i don't know what to do .
i can feel the shake once i turn on the car and also when you shift to reverse or drive specially when i stopped in stop sign
could you pleas let me know where is the problem exactly

Answer
Hello Mohamed:

I Usually Answer Lawn Equipment Questions. However, I had the Same Problem with the Wifes Car a Few Months Ago. The Engine Overheated and Even though they Changed the Thermostat, She had the Smae Problem you are having Now. It was a Blown Head Gasket. The Shop Replaced the Head Gasket and Everything is Good Now. Hope this Helps. I am Here if You Require More Assistance. Let me Know What Happens, Please. Thanks.

Good Luck

Respectfully

John