1995 e320 odd issue in cold weather.
 

The car is a e320 wagon.


The car has the updated wire harness.

Fuel filter has been changed recently.

Transmission service done a few months ago. The car has ASR



In the morning of fall/winter I get a odd issue.

The car starts normally and drives normally. then randomly the car seems like it looses power and drops a gear. the pedal becomes harder and the car only revs when I put more pressure on the pedal and it doesn't want to rev.

During this issue the trans doesn't want to up shift.



when all this happens I just shut off the car and restart and the issue goes away for a few minutes or it doesn't happen again for the rest of the day.


If I had to guess I think the problem is the ETA. or some sort of electrical issue.

If it was a transmission issue, I would think the car would rev/normally and easily.



All this happens only in much colder weather.


looking for other input and Ideas thanks

I checked the date code of the ETA.

98mo4. So 1998 post biowires.

I believe your engine is an M104 with a cable actuated throttle?

Even though you replaced the engine wiring harness, the same needs to be done to the throttle actuator. They suffer the same problem. This should be done before any further diagnosis.