What could be causing my ex to all of a sudden run rich

[brax-91-xlt]

What causes this? When It happens the ex chokes and sputters with rpms in the low 500-700 range.
The exhaust is soo rich you can smell the gas from inside with the windows up!
O2 sensor?
Or something else?

 

[DesertSpive]

My guess would be the O2 sensor, or a disconnected/malfunctioning MAF in open loop.

--Sean

 

[Alec]

faulty fuel pressure regulator, O2's, MAS are the common culprits.

 

[88vert]

Check the vacume line on the fuel pressure regulator first

 

[brax-91-xlt]

where is the fuel pressure regulator? and the vac lines for it?
I cleaned the MAF and the problem hasnt surface again but... I just wanna make sure

 

[88vert]

Passenger side up on the fuel rail,one metal line one plastic one,check the plastic one for gas.If there is gas in it then it is blown

 

[fastcougar]

From the title of the thread, I would have to say it must be her lawyer

 

[CONavajo]

Make sure you change the oil right away if you ever have a situation like this. Anytime raw gas is coming out of the exhaust you can be sure it is being dumped into the block as well. I have seen many spun bearings on vehicles with pressure regulator problems or soaked floats in old carbed vehicles.

 

[toad]

Listen to CONavajo when my FPR went the oil was full of gas.