SL 320 odd miss-fire??

[Old Merc]

1997 SL320 (straight 6)never missed a beat since I`ve had it.Gave it a full service inc` 6 new Bosch plugs.Then did over 250mls to France, started running on 4-5 cylinders when I pulled off the motorway!!miss-fired through the town,switched off in the hotel car park,started back up,problem gone?? Same next day after long run it started to miss-fire when we pulled into a town for lunch,switch off then back on problem gone?? That was three days ago,since then I`ve done over 350mls, back in the UK with out a miss-fire.Have I left the fault in France?? Any ideas chaps.

[mickyveloce]

could be throttle body wiring loom , my C36 had a similar issue , cured by rewiring the brittle old wires . It's a known problem with the M104 engine