10 Six Cylinder Tuning And Performance Guide
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9 Check the carburetor base plate with a straightedge. Warping, though not always noticeable, causes vacuum leaks. Spray carburetor cleaner around the base plate and spacer. Does the engine surge? If so, you have a vacuum leak. Have you looked at the idle air adjustment needle? Technicians sometimes tighten them too much, mashing the tip and rendering it useless. View Related Article
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