I'm confused. "it seemed fine at times"? It shifted into gear from neutral while stopped fine, clutch engaged as normal, upshifts and downshifts were smooth and grind free? "other times not want to go into gear"? would balk at going into the gear gate (even if double clutched?) on a downshift? upshift? all gears?

How does it shift motor off, sitting still, brake off, clutch in and out?

"once I got it in gear it would bang around the whole car when I put the clutch in"? The shifter would shake or would there just be noise? Is there a regular whanging sound on heavy accel that then fades away? Are the ujoints tight? I'd check the motor mounts, too.

Try to 'splain it again, like to an idiot...