Verified answer

its some what normal, those wasn't the fastest cars on the roads,try tuning it up and see if that doesn't help it some, adding new plugs to it will freshen it up some and help it out on power,it will always run better with out the air than with it though,good luck.

Whens the last time you did a tune up? Plugs, wires, fuel filter theres a list of things that could be going wrong try taking it the dealer and ask for a 120 point inspection most are like $40 dollars and it should tell you whats wrong.

It is a heavy car with 132 HP. So, yes it is normal.