why would my ecu keep putting my engine in limp mode if i set the vtec to engage at 5900, but not at 4200? and sometimes it will completely sut my vtec of. ill be crusing and at 100mph my car will bog out and wont continue acclerating, i have to sut the car of and restart it while im coasting at 90 mph, the it will go above 100mph. is it because low oil? or is it because blue wire is connected wrong from my vafc?