I found out (http://phandroid.com/2013/09/24/fifa-14-android/
) that FIFA 14 requires 1.3 GB of free space.
You had 1.4GB, LG needs at least 200MB (0.2 GB), so you only have 1.2 GB free - not enough for FIFA 14 that needs 1.3 GB.
It looks like your failed FIFA 14 installation left a lot of junk file behind. It probably downloaded the partial install files to your phone internal memory, and then when the phone detects insufficient memory (LG's 200 MB requirement), the phone refuses to accept anymore, so now you are down to only 300 MB left (LG's safeguard reserve memory requirement).
Use file explorer or Total Commander.
Check your Downloads folders (internal memory and/or sdcard) the unfinished download may be there.
If not, then look at the Temporary folders (temp, tmp). Look for a large file of about 1GB.
If you find the file, delete it and you will regain the free space.
If the above does not work, then the alternative will be a factory reset to bring your phone to its original condition when it left the factory.
Remember to backup your data first (contacts, appointments, files, etc)