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I would highly recommend against using MAF/AMM cleaner except as a last resort. It's especially risky on self-cleaning hot wire AMMs. I had a working LH 2.4 AMM that was causing poor performance (determined by swapping in a known good one). I used AMM cleaner, using it as instructed and without removing the screens. It was worse than when I started and a subsequent cleaning made it even worse. It now lives at the bottom of a box as a bad example.
I agree with others, possibly two issues going on here, but I would address engine vibration at idle first. A thorough throttle body and PCV system cleaning is where I'd start, all the while looking for possible vacuum leaks such as split hoses. A worn/sticky idle valve can hunt and may cause rough running with the ECU trying to keep up with it. Given that you've replaced the plugs, next after that might be ignition wires and a worn distributor cap/rotor.
A failed trans mount is usually noted as low clearance to the supporting frame and possibly hitting it when going over bumps. Failed engine mounts are associated with engine vibration. Blip the throttle up to high revs and note how much the engine twists under torque.
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