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I have a AG SGI type II (I believe) Sequential LPG system fitted to my Range Rover.
Under low rev acceleration the engine stutters and seems to have a large flat spot.
Engine works fine on petrol. This has been an issue over two different engines, I upgraded the engine last year and the issue remained.
The fault light on the LPG system does display when the issue occurs and also sometimes when it does not.
The LPG system works fine once the revs are higher.
The system is a little alien to me and I'm not far off the stage of replacing the whole front end of the system. I have a 3000 mile plus holiday to do next year so ideally would like to do some of that on LPG
For reference the engine has the following;
new "stage 3" heads
new power-spark HT leads
new cam & followers
and as mentioned pulls like a train on petrol.
1998 Discovery 3.9
1979 MGB GT - V8 conversion