b16a question

[adrian1]

i have a 91 civic hatch with a b16a,when i first start the car my VTEC wont worktill my car is warmed up and my engine light comes on then it will work,then when i drive down the high way for a bit my car will bog out,then when i push the gas to the floor it will pick back up again till i let off and then it will bog, the vetch does not kickin good all the time sometimes it is slugish,any help wolud be great i been trying to figure it out for a while thanks

 

[Citizen_Insane]

Well VTEC shouldn't work until the car is warmed up. You should never drive your car hard enough to get into VTEC territory when it's not warmed up anyway. If you have a CEL (check engine light) what code are you throwing?