Has any know why I have intermitan gas smell 05 pontanic montana

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oxygen sensors wear out and must be replaced around 70,000 miles

Any chance you have loose "fan" belts, they may be slipping and it smells like burning rubber? Or could be a bad coolant leak if the smell is like antifreeze, so not enough coolant to get to the heater coil. Have you checked your coolant level recently?
And perhaps all fluid levels need to be checked. Have you had it serviced by a competent well recommended Mechanic at the recommended service times?

follow your fuel line from your intake tank its has a leak or a pipe that has come loos some where.

you should conduct spark test in spark plug on high tension wire and compression test in the that plug 6&3 strong gas smell is the result of unburn fuel!!!!but the best solution to bring the car to the expert!!!!!!

Sounds like a leaky fuel line somewhere and the pressure isn't strong enough to go through the fuel pressure regulator. Try to locate fuel leak by smell.

my 2000 pontiac has code 420 when on idle is ok on drive or park I step on the gas it drives like motor mounts are broken I let the gas go and it rolls good I change coils wires plugs crank shaft speed sensor I even took of converter thinking it was plug it,on stray pipe replace EGR and still have the same problem, please help lucky fly 119@ yahoo.com thanks

The fuel pressure regulator may be bad and leaking gas on the intake manifold. It's a cylinder shape with a vacuum line and it's connected to the fuel injector rails. When the diaphragm goes bad in the regulator, gas will leak from it and on to the engine, which give you the smell of gas through out the car when it's running. Good luck and keep me posted, Auto Zone sell them for around $15.00 and that can give you the step by step instructions with common tolls and takes about 15 to replace.

does your oil look a little creamy or smell like gas? If so them you have a leaking intake gasket.