i have just put a new 2.0 into my GT.....when the motor starts to warm up a lifter clatter becomes very present and noisy. irritating to drive and makes ya go crazy listening to it. the valves are all adjusted well, and double checked. i'm thinking that maybe i have a weak lifter and that when the motor gets warmer the lifter collapses too easy...? causing my lifter clatter. any ideas?