Did a car trade and on my way home a sound like nuts and bolts hit the street when I shifted into 3rd gear. Now if I shift the front end kinda jumps then slamms back down. Feels as if the shifter sways with the equilibrium of the car. It's freaking me out.
Engine is all stock besides air intake and stage 3 clutch. Any ideas, please help if possible.

 

Look for missing mount bolts, missing bellhousing bolts, missing parts in general.
A 'stock' car does not need some Gran Turismo-esque 'stage 3' bullshit clutch. You have a modified, or ex-modified car, open the hood, get it up on jackstands and look for broken and missing parts.