Sometimes one can dislodge the vacuum hose from the one port
next to the TBI on the manifold that sends manifold vacuum to
support the EGR, the cruise control and the vacuum reservoir ball.
There is a small vacuum devise back by the dist that splits vacuum
to the cruise control and then to the reservoir ball and the vacuum
line/lines can become dislodged there. It definitely sounds like a
vacuum line came loose somewhere. May even be at the EGR itself.
By the way, mine revs really high when I first start it up and
continues to do so until the o2 and the engine gets warmed up.
This was GM's idea of cutting down emissions, but high idling
so not only could the o2 warm up, the heat from the exhaust
would go up through the snorkel and send hot air to help heat
the fuel mixture so it would atomize easier cutting down on
extensive emissions due to the fuel"drops"..It's programmed
into the ECM's parms and program. Only way to get rid of it
is to get have someone reprogram the ECM which consists of
a chip and other things..
out here in long beach and who needs a heater where it doesn't get below 70
What a small world. I'm on the other side of San Berdoo
heading towards the lower deserts..