I have cured my part throttle boost problem. To keep the MAP from sending a
lean signal when under boost, I put a check valve in the line to the MAP.
Inbetween the check valve and the MAP, I put a tee fitting. I pluged the
open end and put a .050 hole though it. Checking with a vacuum gauge,
opening this hole reduces vacuum by about .25 of an inch but allows the
vacuum to drop off when going into boost. Since I've done this, I have had
no part throttle stumbles or surges.
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