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pmiulian,
I have LPG on my car and also have a slight drop with LPG when I run on that.
The difference is around 10% (around 8.0 or so on unleaded and around 9.0 or so on LPG).
One thing to check is the spark plug leads as well as the plugs.
ANY weakness in the ignition side will usually show up as an erratic idle or slight miss with the car at idle.
Welcome to the place as well by the way.
Peter.
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