I've been chasing a problem for some time...

Engine is not showing any codes on computer, but has a very distinct "miss" when under a load, i.e. coming onto plane. I've checked the plugs, and they looked good, so I did not bother changing them.

All connections look good, etc.

Oh, this is a 2008, with only 70 hrs.

Do you think I should change the plugs anyways, as the next step. Or since they looked ok, just move to compression, leak down?

Or should I try swapping coils with the other engine that is good (should have mentioned have twins).

Someone recommended a timing light on the plug wires to verify I am getting spark? Is that worth it?

Or if there is anything else, just yell at me...

I will start with the gaz line ...have you check the pressure in the fuel rail ? supposed to be above 38 psi i guess ...certainly much better mechanical than me will chime in and help you
Christian

AC Delco Platinum plugs only run 50 hrs on my 496's it is a PITA to change them but try it first.

Yeah, I know what you mean...the plugs are a bear to change. Should have changed them when I inspected, but never thought plugs with so few hours would go bad.

I have not checked fuel pressure yet...

I am just trying to do things on my own before I hire a mechanic who will charge me for many of the basics I can do.