alright, so today I changed my oil, put a new airfilter in, and installed a speedcal. it was getting dark by the time I finished the speed-cal, so when i was done I started it up and drove down the road to test it out. the speedo wasn't moving. I'm assuming it was a loose connection, I'm going to wait till tomorrow to check it out. so I continued down the road and decided to make a loop around the block and head back to my house. I slowed down for a stop sign and just before I stopped, the car died. I restarted it, and it idled fine, I took off approaching another stop sign, and it did the same thing. the car idles fine and has just as much power as before, but now seems to died when ever I'm slowing down. is this happening because the speedo is not functioning? or is it another problem?

