2008 Mercury Grand Marquis - Shakes and gets hot

My car shakes and the engine heat level continuously goes up no matter how many times I get my coolant flushed and I need a new muffler

And you need a better mechanic.


^This +1. I suspect you have a stuck thermostat, which means all the coolant flushes in the world won’t solve the problem.

No amount of flushing the cooling system will stop your car from shaking.
Whoever your mechanic that is flushing your cooling system is, they are doing you a disservice.