I had this on my 300ce coupe 1989, turned to be worn/ non OEM distributor cap/rotor/seal, but it happened once on my 1996 SL320 on a slow sharp uphill turn, but not since. Theres an article in Merc club magazine about distributor cap, but not read it, pm me this eve.
The FPR will cause a lack of fuel. The OVP powers the ECU among other things which would lead to no ignition. The OVP has fuses on the top which can blow. Other possibility is the crank position sensor failure