HOLY CRAP, now it's even more confusing.
From the plugs picture it looks like cyl 1&4 would be the ones missing, and the other cylinders running too rich.
There seems no rhyme or reason to the lean and rich mix of the plugs.
If it was a booster leak, then why is number 1 lean?
If an intake leak, then why 1&4 ?
Maybe it is the intake cracked.
You checked for tennis balls in the runners right? :-D
