I have a 1986 F150 long bed 4X4 with a EFI 5.0 ltr V8 I bought off craigslist. It has been sitting for over ten years. I've replaced all the outside components like plugs, wires, cap, and rotor. The EGR looks and tests new. I ultrasonically cleaned the injectors, and put it all back together. It seems to run OK with a little hesitation. I have a code reader and it comes up with a 41 and a 31. One points to the EGR low voltage and the other indicates the vehicle is running lean. Does anyone no what I can check or change to fix this problem. Next thing I'm looking at is taking apart the throttle body and cleaning it.
Thanks Dennis B Sac, CA