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have you cleaned air filter, checked spark plugs. always look at the small things first, ask your garage for a blow by test to see if you have compression problems could also be head gasket any timing issue would result in a very rough idle.
Internal combustion engines requires 3 things... fuel, air, and spark. You do not have enough of one or more of these. If the wires and plugs are old, change them. Air filter, same thing. Fuel filter can also clog up with stuff after awhile. When you take a look at the air filter check where the air comes from. It is possible a little critter has built a home and blocked the air flow (rare, but, it has happened).
If you had a bad mass air sensor, it should register a fault code. Ditto for oxygen sensors. I'd change the fuel filter for sure, as well as spark plugs (make sure they're gapped correctly), and run a bottle of Seafoam through the gas tank. If that doesn't do it, change your cap, rotor, and spark wires (all told you're under $100 for everything).