As you've changed the engine just make sure the engine mounts are in good condition and still screwed up tight. Totally unrelated sh*t can happen coincidentally.
Obviously the hot cold thing would tend to point to something else but worth checking.
Engine shaking when turning off hot but not cold also tends to suggest not crankshaft to me.( plus they take a hell of a lot of force to damage to the extent that it would affect running. Cam belts break, pistons hit valves big ends get a bit squished but crankshaft generally fine).
Does it run-on slightly or just stop but give a little shake. Did you get the temp sensor and fans working B4 you tested the temp with Alfa Diag? if so those results could be unreliable.
Infamy, Infamy, They've all got it In For me!
Last edited by Yorkshirekeith; 14-09-14 at 17:48.