i had a problem something like this ..minor i guess compared but sometimes when i would get on it the power would drop and the lights would dim and vtec wouldnt engage..then all of a sudden power restored vtec worked and i was gone..hehe...anyway it ended up being the main realy under the dash..the connection was really loose and when i went to remove that panel (in my crx) it actually fell out..so i plugged it in and never had the problem again..