I noticed as I was replacing the air filter and I was wondering about also replacing the round rubber seal that fits in the bottom of the air filter housing ? Maybe because it is 20 years old . But I should say , I think It is worn a bit because when I step on the pedal to accellarate I can hear what sounds like an air leak or manifold leak but I did a complete check on all other gaskets in the area . It sound like its coming from the area of the air cleaner intake. What does any body think about this rubber seal being worn? thanks .

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A couple of Ford pickups F 150,250, 350 missed.
1983 240 D 256,000 miles ,auto, ac.