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Sounds like you have a combination of vacuum leaks, along with a possibly a poor ignition system. These ignition systems seems to wear cap and rotors faster than any ignition system I have had personal experience will. You can easily check their condition visibly by removing the plastic ignition cap cover at the front of the motor. There are 3 5/6mm allen screws holding the distributor cap in place. Especially if the rest of the motor is not in good tune, a bad cap/rotor will just make things even harder. Also changing the spark plugs with proper copper core plugs (NO PLATNIUMS) usually makes a world of difference. All of these things are free/very cheap to check or replace.
To check for vacuum leaks, remove the air cleaner and grab a can of Carb Cleaner/Starting Fluid and start spraying around vacuum/rubber lines WITH the engine running. Pay careful attention to changes in engine RPM to locate the source of any potential vacuum leaks. Fix as necessary.
After all of that, we can start looking at exactly how rich the fuel system is operating. All you will need is a simple volt meter to check this. If you are looking down at the engine bay, standing on the driver side, there should be a round plastic unit with a screw-on cap. Unscrew that cap and you are presented with 11 different numbered pins or sockets. This is the X11 diagnostic plug and it can tell you a lot about how the engine is running. Plug your negative lead into the #2 slot, and your positive lead into the #3 slot. Set your VOM to read DC voltage. Turn the key to the "on" position, which is the last one before cranking. Note the voltage. Now start the engine. Your voltage reading will be a fixed number while the engine is running in "open loop", once the engine enters closed loop, this voltage reading should start fluctuating, fairly rapidly. Note the voltage. If this voltage does not fluctuate or fluctuates slowly, there are problems/faults that need to be addressed somewhere else in the injection control system. Now revv the engine and hold it around 2500rpms, and note the voltage reading.
Once you can gather a little information with your voltage meter, it can tell you (almost pinpoint) the source of any problems. Good luck.
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