I have a sierra 4x4 cat with 3 bar map sensor-chip actuator-fuel pump etc...when it tries to past 1 bar and 5.000 rpm it makes like it hits the rev limit! We also can not make a custom chip to the rolling road due to this problem, i have been told that it sould be the map sensor...if anyone had similar experience please share it with me. Thanks

 

Have you fettled with the cables behind the distributor? If so, you may have put them on the wrong way.

 

Thank you for your response, the cables are fine i believe it is the map sensor....