Im helping a friend with his 94 civic ex with an h22a swap and he has been noticing lately that his rev limiter will engage at multiple different RPM's even as low as 5,000 RPM. does anyone know what could cause this to happen? Im a mustang guy and done know much about these motors or computer systems.

 

my best guess would be either the distributor... or the spark plug wires are corroded cause that happened to my type r..

 

its your tachometer i had the same problem in my hatch changed a bunch of parts and 300 bucks later i bought an 80 dollar tach and fixed the problem.