1990 Cadillac Deville Trouble codes

E30 is ISC to great 41 isno cam sensor signal 49 isair management system problem 53 is distributor signal interrupt. 7.0 is a point what is called decision which other buttons need to be pushed. However these are stored codes so dont' mean much. I can't copy on how to do this so you need amanual on how to do it further.

Thank's for your answer.
I just got the shop manual that I ordered today and I can see what thing's are that could be wrong now.

I had my car in for a complete tune up(Coil,Cap,Plugs,Wires), and the darn thing has run worse than it did be fore the worked on it.

I also had the put a new Cat converter on it. About 2 day's after I brought it home I looked under the hood and Laying above the radiator I found a rubber washer.

I thought for a minute and realized it was the one that is supposed to go around the button that contacts the center contact of your rotor,that is under your coil.They forgot to put it in there.

Needless to say I going to take this thing to the Chevy garage and let them figure out what is going on(to many thing's for me to test myself).
But thank's for your answer. Between what you have told me and what I see in the book, It's to much for me.