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P0701

Hello - the P0701 (https://www.yourmechanic.com/article/p0701-obd-ii-trouble-code-transmission-control-system-range-performance-by-cheryl-knight) is a generic problem code which is set by the transmission, but there should be other codes, because there are other possibilities that will trigger this code. A throttle position sensor, whether dirty or malfunctioning,...

The modifications you have done are hard to say if they are causing the problem or not, since they are different than the original equipment specifications. The problem sounds like you are running out of fuel or you do not...