B230F missing power

hello,
I am recently starting to feel a decreasing power on my 240 '91with
310.000km on the counter.
This weekend I was pulling a small trailer (300kg's) and on small hills, I
had to go up in a lower gearing than I was used to. There was no wind.
Other than that the car runs fine, has no oil consumption, starts fine,
idles fine, no fault codes,etc...
I just feel that the car is "out of breath" quicker than it used to be.
what could be the cause of this. I hate to believe that the engine is at the
end of its life...It has always been treated perfectly.
Any idea's??

thanks guys!

 

Compression loss?

 

no I don't thinks so, but I'll check it anyway.
If the car doesn't have to pull it rans perfectly. I'll also check the cat.
Thanks!!

 

Check the Air Mass Meter also.
Clogged Oil Trap filter is a possibility as well.

Regards Per

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