I have a 1999 ox66 and it spits and pops at idle and then dies. It cranks back up every time and then spits sputters and dies. It seems to run perfect at wot. I have replaced 3 low pressure pumps, water separator filter both, new 02 sensor, vst filter, adjusted tps, and removed guts from check valve.
I tested the fuel pressure from the shrader valve and it goes up to 36 psi when the key is turned to the on position. As soon as you crank the engine it drops to around 30 psi and begins to spit and sputter again. I know that this is to low but I need to know where to look next. I was thinking fuel pressure regulator since it is the last thing before the shrader valve.