95 jimmy - computer error code - bank1 rich

The engine light came on, so I had it scanned and it returned bank 1 rich..

Now I've had this error before along with misfire and an EGR misread code.. At that point the car at idle was terribly rough.. New plugs and cleaning the EGR fixed that..

But something else is up now. I've read some of the other threads, so I've got some thoughts:

- O2 sensor
- injector leak
- CPI? (don't even know what that is)
- busted regulator or fuel line in intake

I've noticed the car smelling gassy, but the service station said they can't decect any fuel leaks..

Thoughts? Thanks..