Ok...Im having a similar problem like "spoonfedbaby" When I accelerate...around 5 grand...car just bogs down and feels like it is going to stall...I dont keep on it...I just let off the gas and switch gears..so I dont know if it will actually stall or not...but anyway....this motor has been in my car for like 4 or 5 months now and before now..it hasnt done this..except for one time....at like 5...it felt like my rev limiter kicked in early...but now that I think of it....it was probably doing the same thing it is doing now...its a b16/gsr head and Im using p72 ecu.....could it be the vtec silenoid???