2002 300m 3.5l
 

im working on this vehicle..car has been at several shops and a lot of parts thrown at it..i have codes p0132 and po152 o2s high voltage (been replace by other shops...p0300 rndom miss fires code..bank 2 and can monitor misfires and 2 4 6 misfire like crazy at idle but not off idle..had vacuum leaks.and fixed them..all still the same..o also has code for bank one rich?..swaped plugs coils ect and even checked compression all no change and good..and here is the kicker dies in flight..have duplicated that also.it don't die.it loose throttle then you alsmost stop and it comes back and drives fine..im at a loose here....HELP

A few things to look at.
Have the O2 sensors been changed? If any other brand than NGK or OEM you will have problems (espically if Bosch). These cars are finicky for sensors.
Have seen some randon stalls/no starts from crank and cam sensors at times without setting codes. Again OEM sensors only as aftermarket do not least in these engines.
Search here www.300mclub.org for more
Is it by chance a "Special" ?

I have request all receipts from the customer so I can see what has been replace ect...but what would cause the random misfire on only bank 2..all cylinders and only at idle or first accelarating