Difficult to Start & Cuts out when idling

Every morning my 1996 Peogeot 406 is difficult to start. After three or
four long goes it does get going. After that it will cut out sometimes
when I stop at lights and it goes down to an idle. It has a new set of
plugs and a new battery. It is also running quite hot in traffic. On the
open road there is no problem. Any help would be very much appreciated.
Many thanks,
Kevin.

 

My 406 had the same problem
Turned out to be a fauly accelerator stepper motor