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<DIV><FONT size=2>Some increase in idle would be normal as you are creating a
vacuum leak and taking a significant load off the engine at idle, so it speeds
up even though the mixture is weaker. However if your mixture is currently
very rich and that is causing the rough running, as seemed possible from the
audio on those videos you posted, then the increase could well be partly due to
compensating for the excessive richness from the carb. I must say I was
surprised it still ran at all with the servo port unplugged (although I've never
tried it), I would have expected the vacuum leak to be so high that the engine
couldn't possibly run, that's what happens if the Welch plug blows out of the
end of the inlet manifold. I think there is a restrictor in that port
though, which perhaps make the difference.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>As to what to try next, until you have eliminated an over-rich
mixture as a cause given the above, I don't see how you can move on. You
need a Colortune to monitor what is happening inside the cylinders i.e. check
you have combustion in all four cylinders as well as mixture
strength.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>PaulH.</FONT></DIV>
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<DIV><FONT size=2></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
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<DIV dir=ltr id=yui_3_16_0_ym19_1_1473192723955_22972>I removed it at the
manifold end as it was a lot easier to get to - plugged the port there. Car
ran the same when started, however revs increased noticeably when I removed
the</DIV>
<DIV dir=ltr id=yui_3_16_0_ym19_1_1473192723955_22949>plug while the car was
running. Still ran roughly but not quite as badly and with increased vigor, it
seemed to me.</DIV></DIV></DIV></DIV></DIV></BLOCKQUOTE></BODY></HTML>