Ok, so i just installed a rebuilt KA24DE in the coupe. I get it to run for about 10-15 seconds then it stumbles and dies. It bogs completely with throttle input. It kinda acts like its running out of gas.

When it idling, it's smooth, sounds nice, then a spit and a sputter then stalls. Turn the key off, back on, start engine, repeat above description.

Ideas?