rebuild problem, help wanted.

[Rob8U24]

So i just got done rebuilding my 420a, after a couple fuel and oil leaks i got it running. upon start up i was having sum idle issues, but i expected that. after awhile i decided it was time for a drive, it drove fine no problems , i decided to give it a lil power and it handled nicely, then as soon as i got to 4k RPM it would not let me go any further, it acted like i hit sum kind of rev limit. it drives fine i just can not go ovr that 4k. any ideas on how to fix it?
i had the head ported, the throttle body and cylinders have been bored out, lower compression pistons (i hope to go turbo soon), eagle rods, msd ignition, bigger injectors and PEP valves. if this helps any.

 

[poonman]

Reset the ECU should work fine. Always does it with the 420a.

 

[Rob8U24]

How would you reset the ecu?

well i hooked up the code reader to see what it had to say and it told me that my o2 sensor was bad and that my map sensor had a high output. I'm pretty sure that its my map sensor now.