My 1986 Olds 3.8l LN3 still has a misfire, though crankshaft sensor, camshaft sensor, spark plugs and cables are new, why is that still?

Sparkplugs are not suppose to be painted.

All cylinder misfire, or a single cylinder. Codes?

That'* actually the LG2/LG3, which is a bit different of an animal. You will want to make sure you are using parts specific to it, and not the LN3.

These are the old spark plugs that I left to paint in it, he got new ones, he always has dropouts and does not run clean, codes are not stored.

Yes it'* the LG3 engine code 3, I bought everything at rockauto.com, they're all the right parts.

On another note, I like the wicker chair paint booth. That'* something I would do. LOL.

Besides what Mike asks, how many miles on the injectors and I hope you have changed the original camshaft timing gear?

Injectors 130000mlsWhy should I change the camshaft timing gear?
It'* all original, the engine has been re-sealed.

Because the stock units are nylon and prone to fail after this many years.

+1
Inexcusable in a 90 degree V6, IMHO. Service life was acceptable in a light duty V8, but many of these V6s (both 3.0 and 3.8 Buick) of this era meet an untimely death due to the nylon shedding into the oiling system. Buick fixed these when it became the 3800 (as well as other issues).