So I was driving my 2002 tj and I started loosing power and finally it shut down. I got it to Firestone in Atlanta and they said it was my crank shat sensor. They replaced it and I drove away but as soon as I got to Mobil,al my engine started to knock after getting it to the dealer they said I needed a new engine and it would cost me $7300! So I took it to a smaller shop that deals with jasper engines. Has anyone heard anything about jasper engines?