Hi ,I am having a problem with my S type R ,been running great then suddenly started missing , Its ok when it first starts then within ten fifteen second it starts to miss.
I codes p0351 354 357, a bit odd two on one bank and one on the other checked the plugs and coils and also wiring plugs onto the coils swapped them round but still get the same codes.
anyone had this issue ??

 

You seem to have already confirmed that it's not the ignition coils (as you swapped them around and still got the same codes).
Thus, hoping it's not the ECM, start with checking the wiring and the connectors (corrosion of connections inside of connectors can cause a lot of issues).

 

Thanks for your reply ,it's been suggested possible crank sensor fault but I don't see that causing fault on three specific coils only.
Wiring plugs look good no sign of corrosion .seems like it could be ecm switching or bad ground .