when hot and idling ok the vacum guage reads 0.5 of a bar. when cold and rev to about 2.000rpm to stop from stalling the vacum guage reads 0.5 again, but if i let it idle the revs drop as does the boost guage. when i blip the throttle it drops to about 400-500rpm then stalls. when reving the guage jus sits and operates as normal doesnt go all over the place