 1990 mustang engine dies
i have a 1990 mustang 5.0 and im having problems with the engine staying on. stock engine just recently changed upper and lower intake with a bbk ssi intake along with a 70mm bbk throttle and bbk cold air intake. the car starts fine it idles fine aswell but after i accelerate it dies. check engine light came on and it gives me one code: 53. so i tested the tps sensor and it gives me a voltage of 0.64-0.70. i loosen up the two screws but by rotating the sensor in search for a higher number the highest im able to get is 0.77 and thats with remodefying the sensor. Most of the parts are new including TPS, and IAC. im not sure if this is even why the car dies and i cant test fuel pressure because the intake came with bbk fuel rails and it doesnt have the option to attach a gauge to it. need help bad!!!! cant figure out the problem. | 
