My ITR for some reason when it hits 5600 RPM starts breaking up like I am on a 2step. No check engine light, fuel pressure, timming everything correct. All I did was take the head of and put bigger valves and different manifold and throttlebody on and since that the car does that. The car will drive fine up until you try to go in to VTEC. Any help would be appreciated.

 

oil pressure if the life blood of VTEC. check oil level, and if you removed the VTEC solenoid, make sure its reconnected and installed properly.

 

Yeah I did remove it when I took the head off, I am certain its on properly. The oil is on mark. Man I am beat with this problem.