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Message: <blockquote data-quote="Rednaxs60" data-source="post: 227533" data-attributes="member: 4617">A good afternoon trial.  Best trial to date.  Hard to start and it is timing, but can't seem to get to the reason.  Have mentioned the sync issue, have to find it.  the sync issue appears to be cyclic, happens once a cycle - 720 degrees. The cam/crank/spark igniters/injectors are all contenders.  Was able to get it to idle above 1500, and keep it going.  This allowed me to adjust the spark and VE tables to get the best idle at the RPM settled on.The spark settings are quite high for the RPMs being looked at, below 2000 RPM.  The closer The RPM gets to the 1000 RPM level, the more the engine stumbles and will stall.The plugs are looked at after each trial.  Most times these are coated with a dry soot.  This has been reduced.  The change in spark and VE settings today is promising in that #4 cylinder plug has a white electrode - progress:  Pic of the plugs, #4 on left to #1 on right:[ATTACH]49081[/ATTACH]Plugs 1 to 3 do not have a lot of carbon, #4 plug was a pleasant surprise.Have fuel system work to do.  May try smaller injectors 240 cc/min instead of the OEM 284 cc/min injectors.  Found a web site that have approximate open/lag/dead times for voltages from 10 to 15 VDC.Cheers</blockquote>