Engine Speed Will Not Increase

WARNING: This page is about a different car, the 1995 Dodge Pickup and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Air in fuel system.
Poor fuel quality.
Fuel tank empty or fuel tank vent blocked.
Fuel control lever not obtaining full throttle.
Clogged or defective fuel filter.
Clogged or leaking intercooler.
Restricted, blocked or leaking fuel injection or lines.
Incorrect timing or defective fuel injection pump.
Improper fuel line banjo bolts at fuel injection pump.
Low or uneven engine compression.
Wax build-up in fuel filter (cold weather).