i just rebuilt my 1987 22r engine and propane swapped it but can't get it too start. I couldn't get fuel to the engine so i checked all my vacuum lines. I put some tape over the intake manifold and the exhaust manifold and found that the suction was pulsing in and outwards. anyone know what is going on.
![Huh??? ???](https://board.marlincrawler.com/Smileys/marlin/huh.gif)