pretty simple, vtec used to work good, then one day it doesent.\ b16a into an ef, when vtec hits it hits good for a half a sec, then starts sputtering like its redlining, but only around 45.5k-5k.... Basicly its not engaging fully. Any ideas...i heard low oil can cause this, but my oil is full... I added a qt of oil still does it.. Car is fully wamrmed up.. I cleand both solenoid and switch... It works just cuts in and out. Sounds like its hitting a rev limter around 5500rpms.. Pissing me off any ideas?