No.
YES
Possible vacuum leak
make be there is a gas leak
probably not you have a gas line leak
Try changing the themometer
That 'thing' would be a car jack.
Changing your spark plugs could theoretically make your car faster but not enough to make a noticeable difference. Changing your spark plugs when they are worn will increase your fuel mileage slightly.
On the outside of the tank underneath the car. Easy to change but messy with gas, so get something for the gas to leak into, or hold the line with your finger (if you can) while changing out the filter i guess. On the outside of the tank underneath the car. Easy to change but messy with gas, so get something for the gas to leak into, or hold the line with your finger (if you can) while changing out the filter i guess.
It depends on where the leak is and what is causing the leak.
Try to check the valve cover gasket (most likely that's it) and the pan gasket.
exhaust leak or fuel leak
my car smells like i have a petrol leak when i turn it on but have no leak underneath the car