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When I try to accelorate hard it will take off as normal up until it hits 4000-5000 RPMs. Then it sort of chokes and the rpms go crazy. It will hit about 4500 rpms and drops to 2000rpms and then back up and down. It keeps doing this rapidly, with out delay between. What could be the problem. I just had my head replaced and it didnt do this before.....But i dont think that would have anything to do with it, would it?
 

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My dad had the same problem with a new boat he got. The rpms would spontaneously jump. According to the boat dealer, the engine parts are sandblasted and that the intake and heads (chevy v-8) probably had materials left in it. They told us to run the engine and it should clear out. If it didn't we'd get a new engine.

We did and it was fine. Never happened again. But then again we tried it because the engine was under warranty.
 
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