HI, my 94 plymouth voyager(3.3) runs but after shutting it off the check engine light comes on and the car emits a sort of gas smell and then as you drive it it shakes and acts like it doesn't want to get gas. We have changed the fuel filter, did a tune up, changed thermostat. We are stumped as to what to do next....Please we really need help because we are trying to travel 1600 miles and we are not sure if it will make it.