my car runs very good but when i get to a stop sign or red light it shakess

HAVE SOMEONE CHECK YOUR COOLANT LEVEL,THEN PERFORM A COMPRESSING CHECK AND A CYLINDER LEAK DOWN CHECK,ALSO IS THERE A CHECK ENGINE LIGHT ON AND HOW MANY MILES ON ON THIS ENGINE,THEY ARE KNOWN TO USE COOLANT DUE TO FAULTY PISTONS RINGS,DO NOT LET SOMEONE TELL YOU TO REPLACE FAULTY HEADGASKET BECAUSE THIS WILL NOT HELP IT MIGHT END UP NEEDING A ENGINE,ALSOCHECK ENGINE MOUNT