Got the car back on Friday, it had to sit at the dealership for a few weeks because I couldn't come up with all the money. Total job was $2540 to repair timing chain, re-surface heads, install new push rods, exhaust valves and springs. Labor= $1165, parts= $952, machine shop= $325 + $100 tax and miscelaneous. Labor rate was $72 per hour. Car was running good up until heading to Cape Cod yesterday. Was doing about 70mph crankin tunes when it started running shaky, looked down at scanmaster and saw all kinds of knock with VERY LOW rpm then heard major rap from engine. Pulled off highway popped hood, didn't really see anything wrong...oil and coolant looked good so I drove it slowly on back roads back to dealership and left the keys in drop box. Called them this morning they hadn'nt got to it yet said they would call but no message when I got home. It really was running good everything seemed to be happening faster than what I was used to, drove it for 200 miles over the long weekend then it broke. Definantly didn't beat on it but can't say I babied it either, pushed it a bit a couple times for descent accelaration but that was it. Still had a ton of knock and rap while driving slow back to dealership... what do you think this could all mean?