P0101 Chevrolet -

Question

I had a p0101 code and a p0174 code with my check engine light on.The truck was running real rough when i first start it then after a minuete or so of driving it cleared out. It still hesitated every couple miles and the rpm's were higher than normal, plus I was eating alot of gas. I changed the mass air flow sensor the o2 sensor on the river side ahead of the cadilitic converter put new plugs, wires, air filter, and fuel filter.It is running better but still does the same thing just not as bad and the check engine light hasnt come on yet. I cleared the codes also should the truck run correctly right away or is it a process in which it needs to run for alittle bit. If the problem is not solved what should i look at next. The truck is a chevy 2500 with a 6.0 liter engine 2002
Thank you

Answer 1

Fuel pressure needs to be checked, the specification should be at 55-62 psi,with the key on engine off.