dead cylinder on 1991 Nissan Maxima

my car is sucking and blowing thrue the exaust like a blown head gasket but got good compresion n all 6 cylinders can a vacume leak cause this

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2 answers
Yes, vacuum leaks can cause misfire. Start the engine raise the hood and listen for hissing sound from air leak. You may need a shop with a smoke machine to find it quick for you. Also check for bad fuel injector, these cars had problems with that.
usually when you have vacuum in the exhaust with a miss, it has a bad exhaust valve.

have a leakdown test performed to confirm.

Roy