Just for background, my '87 K5 350 TBI was a purchase from a law enforcement auction for $750. It had been sitting since 2003, and possibly since 2001. Other than putting 2 used tires and a can of carb cleaner into it, I've done nothing. No rust, no dents, decent 4"lift, original black paint showing on frame. It runs and drives perfect (it needs a steering column) and it looks OK too. So in order to get it registered, I have to complete (AZ) emissions testing. I didn't do any tuneup or finish cleaning the TB, because I thought that I could get a waiver if I failed, spent money, and failed again. It turns out the level is $450, so that was a bad decision that didn't matter. It passed the dyno/sniff with flying colors (K5/standard) 1.878/4.00 HC, 13.93/40.00 CO, 2.01/5.50 NOX. Even the gas cap test passed! The problem is that it failed the "Pressure Test". They pinch the fuel tank vent at the charcoal can, and then pressurize the gas tank. Apparently there is an air leak somewhere. I'd prefer to dirty my own hands than pay for somebody else to. Does anybody have any suggestions of vacuum T's, connectors or anything else common to look at?