Bubba the lemon
Newbie
I've got a 97 k1500 5.7, the truck recently started having a bad stumble around 3500 to 4500rpm and I have an afr gauge so I could see the truck going dead lean. Checking fuel pressure I got 52 while running. After replacing fuel pump I still got 52, then I checked the resistance and voltage at the pump and everything seemed good, I replaced the regulator fuel pressure down to 48 running after doing that. Replaced the pump again on mechanics advice last week and got 48psi again. Thinking either bad fpr or injector unit ? Any help appreciated