2000 Ford Focus, ignition key lock cylinder, when to change? and surging?

[G Ford Fan]

Hello,

I have a 2000 Focus wagon with 46K miles.

I understand the key lock cylinder on these cars is problematic.

When should the key lock cylinder be changed out? Mine seems to be working just fine so far.

Also, will I have to get all new keys for the car afterwards? (I hope not, have 4 keys for it!)

I think I saw a thread with the upgraded/updated key lock cylinder from motorcraft, but if someone has that, it would be much appreciated.

I also have a surging at part throttle and already replaced the DPFE without improvment. Should I go ahead and replace the rubber PCV hose that is also problematic I understand? Part # for upgraded hose?

Thanks so much for any help that can be offered.

-Greg

[Sponsor]