it sounds like you have a miss if you changed plugs and your hc is up.. make sure that the wires are installed in the correct firing order...its hard to diag a car when its not in front of you so thats just something to check..also when was the last time you changed your oil...
for the abs and brake light make sure the master cylinder is full and check the sensor in master for good connection...air bag light you will need to have it scanned to see what it is..could be a clockspring problem but dont know unless i seen it.
in my experience, the lien holder is on the title or whatever paperwork you have for registation,, which will be added to your new title unless you have documentation saying you have paid the note off,, you might want to let citifin know that you are moving in case you miss a couple of payments...