everything seemed to be perfect until i drove on the highway, i was in 5th gear, couple minutes later i noticed i started losing mph, i tried putting it back in gear but no grab on the gears, when i gassed my revs whent up, but no movement. i had pulled over to the side to turn my car off. i tried to turn it back on and it wouldnt start. at that moment i assumed it was the clutch. but when i had it towed back to my house, and let it sit for a couple days, i went to go start it up again and it started, this is the part that confuses me, anyone have an idea of what the problem might be? sensor maybe?