1994 Volkswagen Golf wont start

Engine Mechanical problem
1994 Volkswagen Golf 4 cyl Front Wheel Drive Automatic

I am trying to start my vehicle . when i turn the key the car sounds like it wants to start but yet it does not get the extra ump it needs to turn over... battery is still good , i drove it two days ago and it started up just fine , now it refuses to start after sitting for a couple days. the only thing that has changed is the temperature out side ...