I have a 97 grand am it running very ruff i put plugs , oxygen sensor and has real gas smell

Check for the computer codes. It can point to the cylinder that is miss firing. Could be a bad injector. Do a cylinder balance.

Sounds like you have an air to fuel mixture problem, have you put a scan tool on it, being a gm i suspect it may be the mass air flow sensor/map. Pull the codes to see why you are dumping fuel

Exhaust leaks will cause oxygen sensors to read too much oxygen and make the fuel mixture rich. Fix the leaks and you will get better mileage. You have a sensor just in front of the cat so increased air /oxygen will cause this condition.

Oxygen sensor

Change the O2 sensor

It will not hurt the engine as long as it is clean water, muddy water will clog everything. You must drain the system and flush all water out ASAP.

Take car to garage and check engine fault codes. The problems you are experiencing suggest that it may be a faulty oxygen sensor.

Maybe your oxygen sensor is not working

I'm leaning toward a bad sensor, as in throttle body temperature, or coolant temperature sensor. The smell of too much fuel is probably from pushing pedal to start, which shouldn't be necessary on a fuel injected vehicle. What does it do if you leave your foot off the gas pedal during start? As far as fuel filter goes, if it hasn't been done in a while, I'd do it anyway just as preventative maintemance if nothing else.

it is shows more petrol in the combustion chamber check first sparkplugs put new plugs,if you have stil have problem the cylinder head needs to remove means valves inlets and exhaust to granding to make correct angle valve seat.