v8 lpg problem can ne one help

[EV1LXR8]

i have a prob with my lpg...
its a 5.0L and sometimes it backfires and blows a vacume hose out from behind the manifold causing it to run very rough (like its got a cam)the other end of the vacume goes into the passenger side front guard so i cant c where the problem is comming from.
it recently backfired and the hose blew off but i reconnected it and it is still running rough, im stumped on wat it could be, its only running rough on idle when you put your foot on the pedal it seems to be ok.

for a while the gas completly stopted working while i was driving it just splutterd and then cut out, so ran it on fuel for a while then ran gas about a week ago its now working but its still rough on idle.

can any one help me im gettin sick of it and i want the problem gone...

[BlacklistedXR]

Try posting in the LPG section. The guys there no there stuff.
Good luck.

[rag top]

If it is backfiring, I'd be looking at the spark; Plugs, leads and if still a problem, then coilpack.

[JC]

Originally Posted by rag top

If it is backfiring, I'd be looking at the spark; Plugs, leads and if still a problem, then coilpack.

What he said. Rough idle indicates an air leak somewhere. check every vacuum hose, including the one at the back of the motor, plus check the intake tubing for cracks, including the dog turn thing that acts as an intake silencer.

[EvilChief]

also check for damage of the afm, backfires can damage them

[bodes-sh]

all of the above, and, depending on what converter it has on it, if it's an omvl, make sure the bung hasn't been blown off the unused port on the converter. have seen this happen before, and same problem...

[EV1LXR8]

wats an afm? and where is it situated? it dual fuel and it runs fine on fuel but if i use the gas for a period of time the computer adjusts to it then switch it bak to petrol and it idles at about 800 to 850 rpm like its starving when its on gas or something, thanks for the help by the way ill do the things yous said then get back to yous