Originally Posted by ForcedInduction

Thats a case-by-case sort of thing. No two engines wear the same so what fix works for you may be not even remotely right for the next person.

Still, check all the basics.
Valve adjustment (for the 61x engines), fuel filters, air filter, linkage adjustment, linkage bushings, chain wear, etc.

Its only after you've eliminated every possible cause that the ALDA should be adjusted.