i don't know but you should take autotech one like me, but i do know but I'm not tell you
because that's kind of a big engine
Check the motor mounts.
what does idle funny mean? Does the whole car shake? (upper engine mount collapsed) Or does the engine shake/misfire? (Intake manifold gasket)
Engine miss at idle. Can be caused by vacuum leak.
Cylinder misfire. Possibly failed or failing engine mounts.
Engine miss or rough idle, or broken motor mount
It might be a broken motor mount or transmission mount.
The engine idle may be set to low to compensate for the AC compressor starting up. Rev the engine a few times to see if it stops. If it doesn't, there may be a problem with the AC temperature signal or motor mount.
maybe the valve timing is a little bit out
The most probable reason for the engine to shake at idle is the motor mounts may need replaced. This is generally from the front and rear motor mounts; however, the sides may need replaced as well.
"Noisy" because the engine is vibrating more than normal? Low idle will cause the engine to shake. Low idle can be caused by - Dirty/clogged/sticking EGR valve - Vacuum leak or air intake leak - Dirty MAF sensor
Check timing. idle could also be set too low (rpms) so vibration is increased.