I have a 2000 XKR with 43000mi. Acceleration seems sluggish with what I call pedal hesitation. I also get some misfires and check engine codes P0175 and P0172 - Bank 1 and 2 stystem too rich and a P1111 code. The check engine is sometimes accompanied by a "performance restricted" error message in the message display. This will clear itself and the car seems to run OK back to the sluggish acceleration. I had a coil failure with a similar performance restricted warning about a year ago and replaced the coil. I thought I had another coil failure but maybe it is intermittent.

Today on startup engine misfired again, now sending code P0354 - Ignition Coil D Primary/Secondary Circuit Malfunction. Sounds like a coil failure but unclear on which one. If anyone can assist with additional info to troubleshoot it is much appreciated.

 

This code indicates cylinder 4 coil - Bank 1 most rear.

 

Ignoring the other codes can't have helped. Happily there are threads about them and also the workshop manual etc to consult.