You need to take pictures of this 2.0 to 2.5 because even I'm having a hard time with this one.
Check spark plug wires with ohmmeter set on highest scale. Any wire above 30K ohms should be discarded. Check your sparkplugs and replace them if they are worn, where the electrode is burnt or rounded off. Check and replace the rotor and distributor cap if the electrodes are burnt and/or corroded. Check fuel pressure and correct any problems. Check all vacuum lines. check the air ducting to your throttle body, all gaskets on the intake that may introduce false air into the intake. Check map or maf sensor. With maf system, engine warmed and idling, gently tap on sensor, if the rpm's drop or the engine dies, replace the sensor. The map sensor can be checked by hooking up a analog (needle) voltmeter between ground and the map sensor wire. Set the scale to no higher than 12 or 15 volts. If you can get a scale to a maximum of 6 volts the better. With the engine off, the reading will be around 4.5V, depending on your altitude above sea level, with the engine warmed up and idling the reading should be around 1.5-2.0V. Rev the motor up, if the needle pegs the scale one way or the other, replace the sensor. If wiggling the wires peg the needle, inspect and repair the wiring to MAP sensor.
