My XF Coupe started having the this problem last week. The typical CPS symptoms, engine dies and starts. Replaced CPS with Napa/Bosh part a couple of days ago and the cars doesn't die now but it still runs rough. However It did die once on hard acceleration after 4.5K RPM but started right away when I pulled over. Also when the engine hit 4500 RMP the engine misfires every time. The car is till not running right.

Checked the RCM - upon inspection the board looks very good. I can tell the solder joint were previously beefed up with no questionable fractures under the magnified glass.

Next on the list: spark plugs and fuel filter then TB check.

BTW... My check engine light came on again and popped the same P0335 code check CPS. Is it possible I installed a bad part from BOSH? I hope not. I just installed it a few days ago.