on a Holley-style [Most Holley carbs made after 1992 have built-in power valve (PV) blowout protection, but those on older When a good modulator goes bad, trans fluid gets sucked into the motor, displaying symptoms like. Remove and inspect power valve (PV) located in the primary metering block.The power valve will not cause the symptoms that your describing. The adjustment is on the top of each bowl, loosen the jamb nut and turn the needle assembly. Just remove the screw on the upper side of each bowl and the fuel level should be just slightly seeping out. Usually the float on a Holley carb is adjusted while the motor is idling.The idle of a car engine is kind of like a human heartbeat: You can tell what shape it's in just by listening.Problems with idle speed-things like slow idle, fast idle, rough idle, or stalling after idling for a few seconds-are symptoms that something is wrong with your engine.Citations may include links to full-text content from PubMed Central and publisher web sites. PubMed® comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books.
