Bought a 1993 civic ex automatic with a blown engine. Rebuilt the engine and it runs fine until held full throttle.It opens up and sounds like vtec is there but then it just shuts down.I can hold it to floor when it does this and it will shut completely down. However let off the gas pedal just a little bit and it comes back to life. Sometimes it will give a timing code at idle but it goes away when engine is cut off. Checked the timing with a light and its fine but idle is rough sometimes. Any ideas????