the owner before me was an idiot

I bought my car about 4 weeks ago and I forgot to post about this. The owner before me was a complete idiot and didnt know anything about cars. Here we go.....The k&N air filter had not been cleaned in 7 YEARS!!! it was completely black and full of ****. One of the wires wasnt connected the the spark plugs... mean seriously....it was running on 7 pistons for god knows how long. Could this have caused serious damage that i dont know about? Thank god I noticed it on the second day i owned it. He always took it to some performance place that imo didnt know wtf they were doing because they should catch that kind of stuff...sry for the little complaint its just that I cant stand people who dont take care of there cars.

So my question was, could these issues have caused any problums that i should go and look at right away? my car works fine but i figured i should ask just in case. thx
 
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With no spark on one cylinder the only thing I can think of it hurting is the raw fuel going into the cat and overheating it and ruining the cats. Someone else may know more but I do know that raw fuel and a cat dont mix.
 
cylynder being washed by raw fuel doesn't hepl either with bore wear or oil contamination. Guess the guy didn't ride it very hard though or he would have noticed it. Maybe the reason he got rid of it was "the motor was shaking and it must be about to blow up" the service place may have unplugged it to drum up some "repair" business. If they are that bad that they didn't notice it, chances are they would do something like this in the first place.

Leakdown and compression test if you are really worried, check codes in comp anyways for free at autozone.

Goodluck