Thanks for the response Trevor!
Yeah the sludge has nothing to do with the problems I'm experiencing. The car was with my mechanic for almost a week and they couldn't figure out what was wrong with it, but my battery died. They replaced the battery, which was old anyway, and I picked the car up and it ran fine for about 5 days, until today. I was driving on the highway and I completely lost power, I tried to floor it and the car didn't respond. The revs began to flutter up and down and the car was shaking like it was a misfire. I was able to pull over in the breakdown lane and the revs were jumping between 500 and 1000 while the car was shaking. After a little while the car died and would not start. When I would turn the key the car would try and fire and I have power, but the motor will not turn over. It was pretty scary, it's never died when I have been driving before, up until now I've only experienced this issue when the car was stationary.
Edit: Also when the car died the check engine late came on, when I tried to start it again and it wouldn't turn over, there was no check engine light.