w210 320cdi engine cut's out.

Dear Mercs, what do you think of Changing W210 Gearbox with Gearbox Chrysler M300?

Hi guys, just joined today and I'm looking for advice please. I have a 2001 W210 E320 CDI 101000 miles. It has run great until the last month as it has started cutting out while driving. Mostly when slowing down, power steering goes then it dies. It starts back up straight away with no engine...