i need advice a few monthe ago i removed my cats all 4 of them put in mil eliminaters on rear 02 sensor ran good ligt come on 406 code came up checked your sight got info and replaced that sensor light whet of but now the truck will not start on the firtst crank i always have to shut key off and try again always starts on the second try never fails sorry to be so long but this thing is drining me crazy thanks for the help before and now