KDSC400

Shakin when stopped and in park and shaking when in drive without my foot on the pedal and in reverse....fine while driving...also car will not start if i dont rev the engine...it will come on and die out...i see there is an ECU mod will this help and also do you have to have a supra tt for it to work or will a stock engine be fine.... just brought the car it was sitting for a few months 200,000 miles