'92 600 SEL fuel cut off while driving?
 

my 1992 600 SEL is developing a habbit of loosing half of it's power while driving in a straight line, with my foot slightly on the gas. 119,000 miles on the car, and runs perfectly at all times, except for when it decides to shut off half of it's power. if i pull over, and turn off the key and restart the car, then all is fine again as if nothing ever happened? i am thinking maybe i need (2) new o2 sensors. what do you think? if so, can i install the sensors myself, as i used to do on my range rovers? thx in advance, mike