ok may not be the same problem but i had a running issue with my car, stalling when driving under 20mph and at low revs, cutting out when going round corners and roundabouts and high uneven reving genrally a cr*p drive.
I changed everyting i could think of, lambdas,maf,sparks,wiring loom, mot valve, another valve,camshaft actuator, had the ecu checked to no avail, 3 diffrent merc techs looked at the issue to no avail, even olly tried suggested a few bits, no change, went back to olly who checked it all over to find the car was in jap mode and looking for a part that does not exist on euro 3/4 spec cars,went to main dealer a £60 fix to re-adapt the car and a change of a fuse and no more problems. Get it checked on a star, and then go about fixing it, it could be something simple.