My dakota will not start unless gas is poored in the intake wonder if lack of having o2 sencer would cause it not to get gas

The truck has fuel pressure to the fuel rail , i checked all fuses and nothin is blone, the
only thing that has changed since i drove it is i put a muffler and tailpipe on it and had to
remove the back o2 sencer . idk if that should make the truck not run at all i have a 97
chevy with cut wires to the o2 sencer but it still runs but runs rich. idk if same rules apply
to a dakota