Reduced Top Speed/Power
- Clogged or defective PCV system.
- Low fuel pump volume.
- Heat valve stuck.
- Plugged manifold heat passages.
- Binding throttle linkage.
- Restricted air cleaner or exhaust system.
- Incorrect float drop.
- Secondary throttle plates stuck open or not opening (4-Bbl.).
- Clogged fuel filter.
- Metering jets bent, dirty, or incorrect size.
- Power valve stuck closed.
- Throttle plate not opening fully.