1996 Land Rover Other

Engine Performance problem
1996 Other Land Rover Models V8 Four Wheel Drive Automatic 162000 miles

I have changed the coil, plugs, ht leads and the cat.
The Disco is run on lpg.
for a while when driving the engine seems to miss fire and after a while it clears. If the car is parked and reved hard it backfires any sugestions please?
January 7, 2010.

Please refer to your other posting !

Dave H
Jan 8, 2010.