On my 2nd gen b16 the vtec didnt work at all for like acouple of weeks after the swap and out of nowhere it kicked in at 6k rpm instead of the 5.2 i thought it was sposed to. I tried it again and it wouldn't kick in again.lt comes and goes now and I bought a new pw0 ecu since the old one didnt work well and now when the vtec kicks in ever so often at 5.5-6k it feels like i'm hitting my brakes. Weird, any suggestions?

Thank you