4k rpm

Hey guys, I am stumped and really need some help. I purchased this car about 6 weeks ago: http://www.supramania.com/forums/showthread.php?154191-My-91-Supra , it is a 91 ma70 with a jza70 swap. The car was a factory r154 car, and so is the jza70 ecu that is in it. I bought the car with the wrong...