My 2000 360 manual Spider has a fairly constant fault that is driving me crazy. I've tried to solve this doing the usual work.....replaced many parts along the way, and yet still it happens. It's hard to pin down when the stumbling happens, mostly under light load at cruise. Having said that it can also do it under hard acceleration too. Parts replaced thus far - fuel pumps, MAF sensors, all four 02 sensors, all coils and plugs, fuel injectors removed and professionally cleaned and flow tested (all OK) and lastly crank angle sensors. The car has done 63,000 kilometres (Australian guy here!) and aside from this fault.....the car's perfect. I regularly get trouble codes P0102 and P0152. I've swapped MAF sensors from left to right, same with upstream 02 sensors and as far as drivability goes, it's made no difference. Having said that, it hasn't thrown any codes (YET) but I'm braced for the inevitable blow. The stumbling feels kind of like a momentary misfire, but it isn't. My gut feeling is perhaps an electrical glitch somewhere, a plug to a sensor that is weird (oxidised) and making resistance? I'd be most appreciative of any advice. I'm a retired mechanic and know my way around most car related things.....although this car is definitely the one that is forcing me to navigate uncharted waters.