1994 850 turbo wagon 60K miles.

Can hesitation cause a knock sensor CEL? or viceversa?. Here are the details:
Recently my car started to run a little rough...more like hesitation.Right after I feel the hesitation the CEL comes on and it is the 1-4-3 (knock sensor). I have cleared the code, but it will show up again as soon as I feel the hesitation...sometimes within 3 miles....sometimes 10 miles.
Hesitation doesn't happen all the time.
It is worse at low speed, as the car starts to move from stop.
If I floor it, there is a little hesitation but as the turbo kicks in it pull clean and very strong (hasn't loss any power)...almost like you clear your throat.
I thought about fuel filter or fuel pump (never changed), but it feels very powerfull and clean at full throtle, so I kind of ruled out these two.
I haven't seen any correlation with humid, hot, cold weather or cold or warm car.
I always use best gas available (93).
The spark plugs and air filter have about 7K miles.
When it hesitates, it almost feels like missfiring, but I don't have missfiring codes, only code is knock sensor.

I don't want to take it to the dealer because sometimes it doesn't do it, so I guess the dealer might not see or start replacing parts ramdomly.

Any ideas as to where to start would be appreciated.
Thanks.

This weekend I replaced the fuel filter and the car is running like a champ...smooth as silk. What a difference! I never thought the fuel filter could make such a difference.
I would expect a dirty fuel filter to affect performance a high rpm (need more fuel)....but my issue was roughness/hesitation at low rpm and little throtle aplication. Anyhow, I recomend everyone to change fuel filter when recommended if not earlier. Very DIY and inexpensive.

94 850 turbo wagon 61Kmiles

In case it helps others....I forgot to mention that my knock sensor error (CEL) was also caused by the fuel filter. It wouldn't allow enough gas to go through when needed and cause knocking, hence the CEL.
I didn't reset the CEL after replacing the filter to see if it would go away by itself, and it did in fact go away after a couple of days.

Check to see if the air intake bellows hasn't cracked and developed a leak.

Thanks for you suggestion...no "visible" cracks. Is there a way to check for vacumm/air leaks?
By the way, the car had been running without any hesitation for over a week until it hesitated a bit on Friday. Now it seems to run better again.
It is on the last qtr of gas tank now, so I need to fill up a see if that makes a difference.

Could it be that the knock sensor has a fault that is both triggering the CEL, as well as causing a hesitation, rather than the heitation triggering a CEL light?