ok i bought my 05 aveo last november and it had 88,000 miles on it.. i checked the belt and appeared to be new so i went on my way.. it only lasted about a month.. turns out they replaced the belt and not the tentioners or pullys.. the idler pully broke in half as i was getting off the freeway.. all the valves were smashed so i took the head to be rebuilt put it all back together and now when you start the car it doesnt want to stay running and has a knocking sound.. i have replaced just about everything on the top of the engine and still nothing.. i got brave enough to drive it down my drive way and i got burnt by hot water some how.. and theres gas mixing with the oil inside the head and i dont know what else to do!! any ideas??