Caveman11662

i have a 88 f 150 it has a 4.9l it runs great went to get it smogged found no cel but codes the koeo codes are 67 which has to do with the clutch dont care about that but it also has a 41 which is a 02 stuck lean . i then performed the koer test and got a code 42 02 rich i havent been able to find any pinpoint test to diag, these can anyone help