Quote:
Originally Posted by BiggSixx1970
...but I thought that if the vacuum advance was acting up it would idle correctly, but run rougher or cut out as the rpm's increase?... If memory serves me correct, when I replaced my distributor last summer, to set my idle timing I set it without my vacuum advance connected, meaning the engine should idle without the advance, just cut out as the rpms increase, right?
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Vacuum leak will cause it to idle rough or not idle at all. When you adjust ignition timing or idle mixture, the vacuum advance diaphragm needs to be disconnected *and* plugged off at the manifold/carb.
Think about it this way: The engine needs a particular mixture ratio of fuel and air to run, so if you have a leak in your vac system, you're sucking in additional air and making the mixture too lean. It'll be farty, poppy, rough or no idle.
Or... maybe your distributor hold-down clamp loosened up and allowed the ignition timing to change?