am i getting false vacuum reading?

[94talonawd]

sorry. Well it is for a 1g TSi AWD. When I first bought the car, the timing on the crank pulley was set advanced like around 20 degrees. When i took it home i set the base timing back to 5 degrees. I dont know if any of the teeth might have skipped. I was guessing that might be the problem. I was also going to replace the Intake manifold Gasket because i thought that it was leaking from there, but it looked pretty hard to take off so i had decided to ask you guys to see if there was any other problems i should also look into. I am pretty sure it isnt the intake manifold leaking, im pretty sure my timing has skipped some tooth. What would be the easiest way to check if my timing skipped a teeth?