02 Jeep grand cherokee idle

My 02 jeep wj has a small misfire at idle
just enough to tell , has done it since iv
had it and also the idle slightly flucuates
has also done it since i got it , found alot
of people and forums saying it is normal
and seems to be very common on the 4.7
jeeps. Iv cleaned IAC and throttle body .
Tps replaced , checked spark plugs they
look new and gaps are good. Not sure if
the tiny misfire is related to the idle
flucuation . It doesnt appear to affect
performace or anything .