new motor blues

I'm no fan of Aerohead, but at 166psi, it should be firing fine. The fact it's lower may mean the rigns are just soaked with raw fuel. Not a good situation, but not terminal. I would replace the plug with a new one, and verify your firing order is right. I've reversed #5 and 7 before and sometimes it will run fine but skip, sometimes it ends up wioth a dead hole. In most cases, once a plug has been wet fouled, it's hard to get it to fire again without pulling it and hitting it with brake or carb clean to remove the fuel deposits. You also may want to check what cylinder the vaccum nipple is in. If it's 5 or 7, you may want to block it with a plug until you get it running right, then put the hose back on. If it runs good without it, then runs like crud with it, you may have a leaking power booster or vaccum leak. That would effect only one cylinder...That's assuming you have power brakes too...