> On my '71 GT6, my idle speed slowly drops off - normally after
> driving a while (i.e. when I come to a stoplight).
Does it happen worse when the weather is hot ?
> What could be the cause of this? I've checked the throttle cable,
> choke cable, etc. and have not found anything out of the
> ordinary. What sorts of things should I look at?
You might check the float bowl vents and vapor control system. I'm not sure
what arrangement a 71 GT6 would have, but on some ZS carbs there is a valve
that closes at idle and forces the bowls to vent through the charcoal
canister. A clogged canister could cause the sort of symptoms you are
seeing.
Randall
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