Ok Guys, yet another question for my 2000 2.5

since my last venture under the hood for plugs and wires, my 2.5 has developed a strange issue

when I crank her up or shut her down, it feels rough. Almost like the engine is shuddering under the hood. Now, and only at idle, there is a new, quite noticable vibration. RPMs are constant so I dont think its a fuel injector issue or ignition issue. And if I take the engine above idle, even just a few 100 rpm, it smooths out perfectly.

my only thought is my engine mounts could be shot

y'all have any ideas on this matter


thanks

B_E