i got myself a 1997 el falcon gli, with gas conversion, and factory intake, that i run about half the time on gas and half the time on petrol. i recently flicked it to gas and it backfired, blowing the airbox out and blowing a pipe off the intake manifold, righ infront of the throttle. from what i can gather its the vacuum hose for the map sensor, but as i cant find the hose anywhere in the engine, i cant just reconnect it and i cant see where it goes, can anyone help me locate the map sensor, or find out exactly what the vacuum hose is for???