RJ_RS_SS_350

Smell of fuel... do you drive on salted roads in winter?

Oldblue

Could be fuel lines! Corrosion can eat up steel fuel lines

RJ_RS_SS_350

Last time I checked, the injectors could be had for as low as $100 each. Probably less per if you get all 4. If you get the Opel fuel rail with injectors pre-installed on it, the ECM will need to be tuned for it.

So you're really not saving money by replacing the injectors on a maybe.

donbrew

No Advance/AutoZone/O'Reilly? They all loan tools. They also have liberal return policies.
Have you looked at the EVAP purge valve? The one under the hood, it is supposed to be normally closed and they fail stuck open, that causes vacuum leak symptoms.
Smell of gas could be a pinhole in the EVAP pipe, a stuck EVAP purge valve, a stuck EVAP vent valve, a pinhole in the fuel pipe. Lots of other things besides injectors, if the injectors were the cause there would be a P0171 or P0172 code for absolute sure, also if the gas was burning out the exhaust. Raw gas passing the O2 sensors would send up big alarms like flashing CEL, that is the cause of failure for catalytic converters.

I don't understand "It will misfire but codes ".

Your newly stated symptoms don't say "injectors" to me. Sounds like Facebook. The new symptoms say EVAP purge valve or a vac leak somewhere in the intake, most likely around the MAF. Maybe the gasket on the new one got malformed or tossed.