My 95 965 with 190,800 miles on it has an intermittant problem. I can be cruising at 60 to 70 mph and the car will feel like it is loosing power or almost being drug down. I can accelerate and rpms will kick up about 1000 rpm and trans will downshift out of overdrive, but car is holding steady at this point. Then after a while it will take off and be OK for awhile. Other times it will actualy start jerking. Most of the time the car idles fine but sometimes the idle is bouncing all over the place, has died a couple of times at idle.

Sometimes it will lag on acceleration off idle.

I have no codes at this time. I had a pesky O2 sensor code but I finally got it cleared. O2 sensor is less than a year old.
I have checked the fuel pressure and it is reading correctly.
I changed the fuel filter.
I cleaned the Idle valve.
I have swapped out fuel relays with other relays.
I replaced the spark plugs.
The electric radiator fan was squealing on mem so I replaced it.

Any ideas?

Thanks

James