searching for answers: 995 toyota t100 with 3rz manual transmission Code P0170
 

I have a 1995 toyota t100 with 3rz manual transmission and I am having a problem with my fuel pressure. When I start the vehicle all is fine I start driving and when I step on the gas the fp pegs my gauge at 100 psi and stays there till I let off the gas. I tried a new fp regulator and it did the same thing. The truck seems to run fine what do you guys think it could be. This hole thing started with throwing a p0170 code. I have since have replaced the temp sensor o2 sensor and mass air flow sensor. Any help will be appreciated.