Car shakes after installing alarm system?

Alright. I installed my alarm system today and it works great. I drove to a friends house and hung out for a while. On my way home my car seemed to be a little sluggish. When I got to about 45 mph my car started to shake a little. It rained while I was at my friends house but that was about it. Some of the main wires that I hooked up that make me think might matter were a wire hooked to my starter wire to disable the starter, and a wire to my igition 1. The car starts fine and everything seems good but when I get to about 40-45+ the car starts shaking or vibrating as a car would shake if it weren't aligned or something. I am gonna drive it a little bit tonight and see if it still shakes and update what happened.  Does anyone know if installing an alarm would cause my car to do something like this...or would it be something else....maybe engine related.   Any replies are appreciated!!!!