Weber Idle Jet
 

Hmmm.

While investigating a popping and studdering that is occuring on decel or steady cruising I was checking my idle jets for clogs and I noticed that all my jets are 60's except on cylinder #3 which is 55.

Is this normal or do I need to start digging through my box o' parts for another 60 jet?

Oh yeah, am I on the right track for correcting the popping and studdering?

You could have a 55 that has been reemed to 60... Definitely give them a clean with compressed air or carb cleaner (don't use a wire). In relation to popping you could have air getting in at a failed seal somewhere.

Cheers