Ticking sound on sequoia 2006 after timing, water pump and 4 valve work on drivers side

Had a shop change timing and water pump they also did
valve work on 4 valves on drivers side due to valves  being
bent after botched timing and water pump replacement. No
errors displayed in dash after fix. But Now it makes a
ticking fluttering noise. Sort of like when a lifter is stuck.
Sounds like diesel engine.  It diminshes after it gets
warmed up but its not as loud as a cold start. Vehicle runs
well yet im worried about sound i feel valve job was done
wrong or maybe a worse situation. I havent noticed any
loss of power while driving, does not overheat, does not
generate engine error lights. Can I still drive it? I'm also
worried it may be a rod knocking but sound comes from
top drivers side and quites down after driving and warming
up. I'm taking it back to the shop that did the work for the
3rd time. I'm so disappointed I feel they don't want to honor
their work. Aside from small claims what can I do? Also
what is the problem any ideas? Any help will be will
appreciated in helping narrowing the problem?