Need Help!! 460efi. Codes 41,87
 

We're going to the NASCAR race at MIS this weekend. The motorhome is not well. It's a 1989 Econoline 350 with a 460 EFI engine (EEC-IV). We pulled the codes today and got 41 KOEO,C and 41,87 KOER.

41,C is O2 sensor signal
41,R is lean fuel mixture
87,R is fuel pump circuit

It just got a basic tune-up, and the forward fuel pump was replaced (one in tank & one on frame rail). From what I've seen the in tank pump is a low pressure unit and the forward pump is a high pressure unit.

Any ideas??

Any & All help is appreciated.