RE: Service Engine Error Code PO442
Not to sound stupid or insult you but have you check those?
Keep in mind their can be other causes. I have a 96 Silverado, I don't remeber the codes, but it said both sides were running lean, it ended up being bad plug wires.
On the fuel rail you should have a tire valve steam, it should have a cap over it. Let the pressure out, then put your ear on the tank and have someone turn the key forward to run, you should hear the pump building pressure, if you don't you have a quiet pump or a bad pump. I haven't tried to lisen to a new one yet, I may go tomorrow and test drive one though and get back to you, (I need something to do anyway). On my 96 i had a remote starteer, if you stood close to it you could hear the pump before ti started.