2004 Mazda Protege

I have been having problems with my Mazda. It is an Censor problem but i dont know how to fix it. The car runs slow because of it and only tops out at about 50mph now? and when ever I stop a a light or something it wil start shaking. But when i pulled over i turned off the car waited 10 seconds and turned it on again and it was fine for about 5 minutes then it acted up with the problem again.

You are most likely about to have your fuel pump go out. Check or have your fuel pressure checked.