How new is the gas in the tank?
Hi Pedro-
Normally I would agree with Grant that plugs shouldn't matter that much with minor fuel contamination such as a little diesel or oil in the gas. I commonly run synthetic 2 cycle oil when breaking in a new engine or running one that has set for a long time.
But I have encountered what you are describing on stale gas particularly the stuff with ethanol in it (basically all gas in US) this stuff seems to go stale very quickly 30-60 days and is a particular problem with carbureted engines that are not run regularly.
I've made it a rule with my vehicles never to try and fix a poor running or hard starting problem without putting fresh gas in. Generally I drain the tank in question with a siphon made up of an outboard motor fuel squeeze ball primer with a transparent fuel filter to check for trash and water. Then I dump in a few gallons of really fresh fuel. Amazing how often problem goes away.
Plugs acting like you describe can also be a symptom of a weak spark. Even if you have just check the entire ignition system check it again.
Does the Iltis have a electronic ignition or old style?
Cheers Phil
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