OK I'm living in S/W of France (my mistake) My v8 Petrol is misfiring on 3 cyl. (according to GAP tool) running great, but a small hick up sometimes at the red light running idle. Every now and than an engine light tells mee I have one or two lean banks on petrol. That either disappears or must be erased.
On lpg she runs fine but starting takes more time to fire up. No lean banks while driving.
Garage can't find anything wrong, been there 3X times now.
According to workshop lambda is OK, sparking plugs are new, cables are new, injectors have been cleaned, alternator is new, even used ethanol killer.....
anyone of you highly knowledgeable peeps can shine a light on this issue?
I thank you very much in advance

If it's the same three cylinders all the time, swap around the coil packs and see if it changes as well...  Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Thanks Pete, since I am a complete non tech on modern cars I had to look it up, but I will def. take care of that.

 Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-