I realise English is not your first language... yet sorry, I'm not really sure I understand what you mean by push/pull?
Does it falter, stop firing, run rough. Normally I'd point you to coils or narrowing the plug-gaps. Gas likes good ignition, and narrower plug-gaps. 0.7mm for me. You say you've done that?
I'd be rid of the iridium. Standard plugs set 0.7mm is best.
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Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl**dy blah."]
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