I'm asking you on the forum on behalf of a friend, he has a bravo 1.4s. with engine problems, he gets it up and running for about 15 mins, he tells me that it's like the valves arent closed by the hydraulic lifters aren't doing it right, he has until now changed the cam, valve, lifters. he have also checked the pistons for wear or damage, and they are fine.it starts alright for 15 mins and then it dies out, you have any suggestions, i know theres alot of things that would couse this problem