Clean your mass airflow meter with wd40 , clean the wires on it, connector and all.
You should also clean out your idle control valve, it being stuck in any one position is a sign of carbon buildup. Ultimately you need to check your mass airflow meter and make sure all your hoses are attached correctly. You might end up needing to change your idle control valve and mass airflow meter. Gluck and lemme know.
P.S.
you can check your coils by unplugging and plugging the wire that goes to each of them. If the coil is working, when you unplug it your engine idle will change instantly. If/when you come to a bad coil, your engine idle will not change. (because it was not working).