I've posted before about some idle/power issues with my '86 560sel. It starts right up when cold, but idles roughly for a bit. When I take off, I have alot of power, but when the car warms up, the power seems to be so so. As I've stated in previous posts, I've replaced the OVP, EHA, fuel pump relay, fuel distributor and temperature switch, cleaned the idle air valve, checked timing, and changed all manifold and vacuum lines, as well as all filters. I have sprayed carb cleaner on and around the injectors, but have not noticed any change in idle, that would indicate a leak. The only other thing that has not been changed out as of yet is the o2 sensor.

The car has a hesitation/sputtering when it warms up. It manifests itself when you accelerate from a stop. Also, I am intrigued as to why it has so much power when cold, yet becomes a dog when it warms up.

This change in performance literally happend from one day to the next.. befofre, I had great power, all the time. I did however, have a "miss" that would come and go without any rhyme or reason.

I cannot help but think that I have something electrical going on, any ideas??