spark plugs all firing?

[chrisnsarah]

Ii there an easy way to tell if all the plugs a firing? Will going around with a timing light on each wire work? I have new plugs. wires and cap have about 5k mi on them. TFI coil and cap. Should I open up the plug gap some more? They're still gapped at .035. The idle is still shaky with 15 Hg vac in neutral, like there is a misfire. I used to see it around 20 on the old 360. I can't find any vac leaks unless they're under the intake.

[graham]

Timing light will work, but you shoulb be able to hear if one or more aren't firing. I'd bet on a vac leak.