Mitsubishi Repair: My car wont pass emissions and is idling funny, egr valve, amp fuse

Question
I have a 1990 Mitsubishi Eclipse, Manual Tranny 2.0L GS. I took my car up to be tested for emissions and my hydrocarbons are high but the monoxide is real low and normal. I have replaced the plugs, connectors, along with an ECM.I've changed the oil and put in cleaners into my full tank along with good gas. I've also been having a problem with my car running. It idles low and when i let off the clutch the car stops completely. Recently my battery ran low and i had it recharged. But for some reason the inside lights had stayed on and i had to pull the fuse for those lights. Now my radio won't turn on and nothing electrical works unless the car gets started except for the warning lights. I can't help but wonder if this is all connected somehow. I also have problems with my engine missing and vibrating badly. I've tried a lot of things but nothing seems to help the situation. I've checked the fuel system and the injectors but none of those are bad.
I'm wondering if I have a bad ECM but that was replaced 2 years ago or so. Also since when I come to a stop and my car dies I wonder if the ignition might be bad?

Answer
Matt,
Many times a bad EGR valve, fouled O2 sensor, and/or bad catalytic converter can cause excessive hydrocarbons.  Though I would guess the EGR valve is to blame because it's whole job is to maintain the accurate HydroCarbons and Carbon-monOxcide concentrations.  If the EGR valve is stuck open, unburnt fuel in the exhaust will continuously pass back into the intake and not be regulated.  If that EGR valve never closes at all, your monoxide count will be low, but that can cause your hydrocarbons to increase.  Have your EGR valve and EGR soleniod inspected and replaced if necessary.  Clean your throttle body and upper intake manifold if you can.  It may help.

There are many interior lights all tied into a 10 amp fuse located under your steering wheel.  Double check to be sure nothing is blown.  You should also check your main fuse box located next to you battery.  If any fuses are fusible links are blown or worn thin, that can also cause problems.  Check with the auto parts stores in your (like AutoZone) to see if they can check your alternator.  Most Mitsusbishi alternators last about 7-10 years.  So, if you're still using your original alternator, it may be time replace it.  It typically gives you a lot of warning before it dies completely.  

It is possible your ECM may be faulty again, but not typical if it's been replaced.  But you can still pull it from behind your radio to make sure it's still operational.  Check all the pin connections and the harness.  Be sure there are no bent pins.
Good luck!