i have a 99 turbo gsr with lots of mods (every thing except internals). when vtec kicks in in forth gear it seems to fluctuate in and out of vtec, this only has happened a couple of times and it is only in forth gear. any info would be great.

 

check your oil level....

 

vtec works off of oil pressure, check your oil and make sure you dont have any leaks at the solenoid...

 

thanks for the info.