Easiest engine swap?

Sup,

Newbie to this forum. Bought a 97 AE101 Seca hatch 2 months ago. Not sure if I'm in the right place for my issue to be answered. When I'm stopped in traffic, and my a/c is on; The motor shakes heavily@idle. So every time I stop, I put it into Neutral just to keep the revs up and minimize the shaking from the engine (But really..It's just to save the embarrassment from people looking at the car shaking plus hearing it). Any ideas on what it could be and what I need to fix/check etc? The shaking minimizes when it's in Neutral and obviously goes away completely when accelerating. No matter how long I have the a/c on, or how hard I accelerate to make the pump work, the temp of the a/c still aint that cold. It's weaker than piss! Apologies if this question has been asked before but I'm a newbie to "Forums" and tryna get a feel on how they work. Thanks in advance : )





-bombarolla