What Edward said. You can try to start with some "motor crack" (starting fluid) as the A-4 will run on 2 but rough, this roughness will often get the valves shook loose and the additional RPM's will get them moving faster which can shake them loose. You may hear some lifter noise.
Put a bit of MMO or TCW-3 (best) in the fuel at about 100:1 ratio. This oil in the gas will be delivered PAST the valves aiding in lubrication and "cleaning" the stems a bit.
NOTE it does not take much "off the seat" of the valve to kill compression
.
Dave Neptune