My car is not starting properly is it spark plugs and gas line?

Not sure what you mean by "not starting properly". It either starts or it doesn't. I wonder if you mean the engine does not run properly after it starts. If that's the case, do not start spending money on parts hoping to solve the problem until you know where the problem lies. You want to check the plugs, air filter, inside the distributor cap, for cleanliness. After that check the spark plug and coil wires for cracks. Lastly, check for a good spark on each plug. After the "firing system" has been eliminated as culprit, ensure there is fuel getting to the combustion chamber. Check the engine for compression. Lastly, scan the diagnostic terminal for trouble codes (could be a bad throttle position sensor or something similar)