I finished a stock head swap on a 98 h22a, after adjusting the valves and started it for the first time it idled great. However, I now notice a loud valve train chatter (sounds like one very badly adjusted valve click noise, not the whole upper end) around 2500 rpm that goes away above 3000 rpm there is also a mild sputter that goes with the chatter. I rechecked the valves and all were within spec. At first I thought it was a weak valve spring, the odd thing is if I allow the motor to idle up to normal temp the chatter moves up to 3500 rpm and goes away around 4000 rpm. Since I'm backed up on other jobs so I thought I would bounce this off a few people before I dig into it again. Thanks in advance.