If the O2 sensor fails, the system thinks the engine is lean and tries to richen it. This could cause the engine to stutter, but so could a lot of other things. Vacuum leaks, bad sensors, weak injectors ... I wouldn't jump to a wiring harness without an orderly diagnostic process.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe