4.6l ENGINE SHAKING(HELP!!)

Hi everyone I had a question about my 94 T-Bird 4.6l V8 and was wondering could someone help me out. The head gasket on my car blew and instead of me getting them repaired the shop said get another engine ......so i did. I've put 3 engines in this car it they still wont wont and Im tired of paying for them and to have another dropped in. So what i was thinking of is just to fix this last one. It starts RIGHT up in the cold or when it its hot but the thing is that its shaking alot. Sometimes when you press the gas it rev's up then most of the time when you do that it shuts off. Could anyone help me out PLEASE!!!!!!!!!!!

if the engine itself is shaking you might want to check the engine mounts ont the car itslef and the engine. i just had a rubber bushing go on my engine mount and the car runs like a huge piece of garbage. smoke, puttering, high thermostat, etc... head gasket like problems.