I have a Silverado with a 5.3 that keeps throwing coat p 0 1 91 low fuel rail pressure I put my fuel gauge on it you'll gauge on it it will start up and hover at about 58PSI then when driving around it will drop to about 45PSI I put my scanner on it and I was able to bump up the fuel pressure to about 60PSI but it only will stay there for 30 seconds so the pump is able to go higher it's just how do I get the pump to stay at 58 to 60PSII have already changed the fuel rail pressure sensor