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Originally Posted by Richard Wooldridge
.............................................It might be running too rich at idle, one thing you could do to check it is to remove the air cleaner top cover, and VERY SLIGHTLY press down on the air plate, say 1/16th to 1/8th of an inch, and see if the idle smooths out. If it does, it is running too rich.................................................
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Richard...doesn't
down make it richer...it's a down draft air flap, yes ?
I use a magnet to pull it up on the center nut....
Backfire will sometimes cause flap to change position.
Rich is usually control pressure problem although CPR usually fails lean.
See if cold start injector ( Blue Bosch style connector) is spraying or constantly powered up.
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