tappet noise on 1990 Cadillac Eldorado

Engine has a loud tappet noise on right side. I am trying to find out how to adjust the valves to see if the noise goes away.

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
check your ignition coils, thats what the noise was on my 95 eldorado