Hi i have an lpg ldv convoy have just put new spark plugs and filter and oil in. runs fine but seems the cough some times on lpg in second gear??????

I assume this is dual fuel.... LPG and gasoline??????? Is cooling system full? If so, probably plugged filter on LPG convertor. If you are not knowledgeable with LPG, get someone who is. LPG is highly explosive.

Throttle pedal switch fault.

Robert your going have to check the oil pressure the oil pumps on these engines tend to let go. What happens the key way that drives the gear strips and at low rpms it doesn't pump oil to the top of the motor but when you rev it the gear spins a little faster that's why it makes less noise you will have to replace the oil pump. As for the missing the hydrolic lifters are no working properly because of the low oil pressure.

Hi
I would have though your garage would have either cleaned or replaced the aur mass sensor.
You can find this four/five pin plug somewhere between the air filter and the throttle housing or google its location.
These often dont show up well on diagnostic computers.
You can run engine with plug disconnected to see if it runs better or not. If it does then buy and fit a new sensor.
All that really controls your fueling is coolant sensor and air sensors....these often fail the most.
Good luck

Roger

On an LDV pickup convoy 05 plate how tight do you make the front wheel bearing nuts

Gm has a bad problem with their fuel pumps if it is going out it will get kind of sluggish when taking off but when you build up speed it will level out

have you done the air filter or compretion test may be it was run on veg oil at some time in its life

I would be looking at water in the air filter or blocked air filter.........
It sounds like its choking.
Hope this helps.

is it poss. that the timing belt is off a tooth or 2? were the spark plug wires removed and not put back in correct order sounds like a timing issue to me. maybe map sensor problem