a few months ago my car had a sticking lifter that caused a misfire. i replaced the lifters, and a few weeks later I quit running lucas UCL. today the misfire came back. it only misfires when first started, once it warms up the misfire dissapears. i don't want to tear the car apart again, so should I just seafoam the intake manifold? run lucas again? the valve that stuck open was only barely not sealing, so the car ran alright with it leaking. when I took the rockers off the lifter was stuck, (the lifter is between the rocker and the valve stem on this engine) and the valve took some tapping to get it to seat fully. i think the valve stem has some varnish on it where it should fit into the guide, from it's time hanging open, so the valve sticks sometimes. im considering putting it back on the UCL to see what happens. it only started misfiring again today, and it only did it on one start, so I don't know if I should even worry about it.