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There is no way this is a vacumn leak because if it was a vacumn leak it would do it all the time!!!
I dont agree , the only way a Engine can go to 4000 rpm is air is getting into the engine to sustain 4000 rpm , it can only do this through the IACV or Vac leak

The IACV is nothing more then a electronically controlled Vac leak

You stated that the engine wouldnt start with the IACV unhooked , it should and it should idle at around 700 rpm with it unhooked

Tom
 

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Like Paul said, check and make sure the 5v reference is in spec. The maf, tps, fuel rail sensor ect all run off 5v.

Have all the ground wires attached? Are you using the original or newer throttle body?

No car should start up and hit 4K rpm, something is definitely wrong.
 
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