By stock filter I mean the fuel filter thats in the engine. There is no aftermarket fuel filter. I will check the air filter again, and no I dont have any way to measure the boost. How do you suggest I do that.
Okay so when I start the engine it idles good and runs smooth. But when I put the truck in drive and give it gas it ramps up to speed very slowly. It doesnt seem to want to shift on its own, I have to let off the gas for it to go to the next gear. I can get the truck up to speeds of 70 mph or more but very slowly.
I have replaced the fuel pump. Actually upgraded to a FASS Fuel pump and have a reading of 80psi of fuel pressure on the rail, so I know I am getting enough pressure before the fuel filter bowl.
The truck runs only if I hold the gas pedal in and it will rev all the way up to 3000 rpm and the turbo kicks in as well. It will not idle smoothly all the time. Sometimes it does for a couple minutes and then it starts to rev up and then bucks and shakes and dies.
I have tried driving it and it is very slow to get up to speed. It accelerates very slowly, even with the pedal to the floor. It shifts very rough as well and often I have to let off the gas to get it to shift at all.
I have tried preplacing the fuel pressure regulator and it didnt seem to change its behavior. I did find that a previous fuel filter change went bad as the mechanic left the bottom of an old fuel filter inside by accident. That ruined my heater element and broke the filter bowl drain valve o-ring. I replaced the heater element in the fuel bowl as well as the o-ring.
I have no idea what to do next. There is a fuse on my battery on the driver side that is 5 amps and keeps blowing. Not even sure what it goes to.
What are the symptoms of a bad injector pressure regulator (IPR) ? Could that be it?