Gas leaks from back in after a few minutes of driving

When the gas-cap is plugged, you build up vacuum in the gas- tank and cause the gas flow to stop.
Use premium gas only, ETHANOL in the mix is attracting moisture/water which is part of the problems.

1st move is to ck the fuel PSI & emissions. Possible cooling system cause.Scan computer & check sensor readings & the emissions readings are the first moves. Check spark plugs, ignition spark etc. Good luck

I would change the oil, disconnect the coil or fuel pump and crank the engine for several minutes to let the oil pump work.
Put a few gallons of fresh gas in the tank, and see what happens.
You may have to run that gas out and then replace the fuel filter.
If it starts ok, just let it idle for several minutes before you raise RPM. Listen for noises and see if the cooling system works.
There is a chance you may have to change the trans fluid and filter after you try to drive it.
And after driving a few miles, be sure and check the brakes and all of the engine hoses for leaks.

You have to explain in detail what was checked & how
by the mechanic

I would start with checking fuel pressure at the motor with
a gauge & road test with the gauge tied to a wiper

Is the battery any good?

Was the TPS Sensor back probed & checked?

You got a MAP Sensor on it,that could be a problem?

Checked EGR System over good

Checked alternator voltage,current & diode leakage.

Bad ignition switch?

Fuel pump relay?

Coolant temp sensor

Have to test the entire vehicle Evap System also

Vacuum leaks

Exhaust Leaks

Meachanical Condition --cylinder leak down test

You'll have to figureout if it is a fuel or ignition problem.Is the check enginelight on ?

indicates too much gas in the system
did you use the can method or suck the gas in using pressure gauges on a manifold

Sounds like you have a injector leaking you can try looking at each one when you crank it and you may be able to spot the leak.

you are loosing power. gas doesnt burns well, maybe leak coming form your catalytic converter.
but try new spark plugs then new distributor cap, but still mis-firing, ignition coil might be problem.also try filling up injection cleaner first of 8 oz. full to your tank. run your car for few minutes to clean up your fuel injector that was cloggeup.

Sounds like a loose fan belt and probably needs to be tightened...get back to me if you have any further queries

throttle position sensor most likely...