What can happen if I install a spark plug with 1.1 spark gap when my car's manual recommends a 0.8 spark gap? My second hand Vios 1.5G had 1.1 spark plugs installed (last tune up when bought was Shell service station) so when I had it tuned up recently, they also installed 1.1

I've been driving it for a year and it runs smoothly naman, except that it feels a bit underpowered at times. I'm also concerned about long term effects of a wrong sized spark gap, if any.

TIA!