did some welding now no start condition.

I just fineshed welding in sub frame connectors and took my car for a drive to see if there was any differance. Before welding I did disconnect the negative battery cable. The car ran great before but when I started it up it seemed to run rougher then normal and took a little longer to warm up as I drove off I noticed a slight hesitation just as I started to give it gas, and as I drove it, it got a little worse. I thought maybe it was starting to foul plugs again but the set I had in it have been in since the beginning of summer and I have'nt had any fouling problems since.
Well I decided to stop at the video store on the way home, when I came out of the store it started right up but then sputtered and died. It did this a couple of times and then would turn over but no fire. I checked gas tank but there was half a tank. And I could hear the fuel pump and I could see gas in the filter at the carb and gas squirted when i pulled back the throttle. So the first thing I did was I went to autozone picked up a set of plugs and changed them in the video parking lot. It turned over but acted like there was no fire at all just turned over. I let it sit a couple of minutes and it was hard to start but it did fire and then died right away. When it did start it would try to die unless I was giving it gas then it would eventually die anyway. Then no fire again, just the engine cranking but acted like there is no spark.???? Do you think I may have damaged my orange dist box when I was welding? I've heard of these boxes going bad but have'nt had any experience with them, this is the mp electronic dist and orange box.
When I was welding there was one time when I pulled the welder a little closer and in doing so I messed up my ground and my weld sputtered a bit before I realized my ground was'nt making a good connection. Any thoughts on this would be greatly appreciated, Thanks..