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I am suffering from a very erratic idle on a 2.5ltr sve lpg converted car, currently 58,000 miles. The car is an automatic, and seems to function fine in all other manners, but, when put into neutral the revs jump up and down from 1500 to 2200rpm making the kind of noise you would get from deliberately revving the engine. The car functions in all other ways ok, when in drive, with the brake on, there is no rev problem, but then the engine is engaged... There is a consequence of this, at speeds of low revs, the car gets a slight jerk forward as it pushes up from the 1500 to 2200.

This happens whether or not the car is running on lpg or petrol, but doesnt happen when the car is first started up, ie it runs for a short while before the problem happens.

A general mechanic who has done work for me in the past, said his fault finding equipment couldnt pick anything up and suggests i go to dealer and see if their system can locate the fault.
 

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This may or may not help and sure your mechanic has checked it - years ago I had a car with same symptom and it turned out to be air mass flow sensor. As said - this has probably already been checked but I had the same thing - when in gear at low revs and on idle it raced up and down - in gear at higher revs - no problem. Mine was manual so I could control this with the clutch but would imagine an auto box could be more tricky when pulling away. Could also be throttle control module - not sure if this is what it's called but check it out. I've also got a 2.5 auto so will have a look around it and see if I can find out what I'm talking about!
 
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