wierd engine idle?

[hepps44]

ok so this morning i started my car and it started and idled fine then i put it in gear and it started and continued to idle, uh the best way to discribe it would be a carberated car or desiel engine that feels like it is shaking it's self apart then then the engine warms up to normal (the middle of the temp gauge) it goes away and runs normal can anyone tell me wht is going on?