gte300

Whats up everyone. Im new to the site sorry if i posted this in the wrong place. NEED HELP. I PICKED UP A 01 IS300 with the aristo vvti swap single turbo. I bought the car cheap but it needs a few things. n/a supra 5speed trans aristo wiring harness and ecu. just did a compression test 150's all across all 6 cylinders. cut a long story short. The car starts up fine. seems to idle good until i give it gas. reving over 3k rpm car wants to die if i dont feather the throttle on its way down. The wiring harness seems to be a little chopped up. IM DEBATING ON GETTING A NEW HARNESS? ARISTO OR IS300? AND I WILL ALSO WANT TO ORDER A AEM EMS SOON. WHICH EMS SHOULD I PURCHASE? sorry if i sound stupid im new to these cars. ANYTHING HELPS!