Ok heres my problem i have a 99 dodge stratus, i had no problems with it until recently when i was at a stop sign or at a stop light my car would shake a little bit. It was like SHAKE....SHAKE SHAKE SHAKE....SHAKE then it would stop, today i was driving and while i was driving i felt like my car was shaking and it would like jump in RPMS (i think) when i put it in neutral the shaking would not happen or would happen very briefly. What could be the problem and how much do you think it would cost to fix? Also once i turned off the car it sounded like my engine coolant was bubbling and i also notice my car was eating gas a little more than usual but that could just be me.
any advice would be appreciated.

EDIT: I know this is probably not the forum to place it on but i need help!

check your output speed sensor the transmission thinks it in overdrive when you come to a stop

,....um dude chek the date........i bet the shitbox is in the junkyard by now

actually no... Ted....my last beer tasted like a Dodge Stratus.... maybe that one was Toolman's??????