Need advise... PLease help not sure whats wrong
 

Hi all,

So i'm trying to fix my mom's car. 2011 Honda civic lx.

I changed the spark plugs to bosch and denso ignition coils. Somehow it helped just a little bit.

problem:

losing one bar from gas gauge from 10 miles!! :( really bad

when the ac compressor kicks in, the car vibrates a little bit (just when idle)

Can someone direct me to the right path?

I bought bg-44k just to try out if this would help..

Thank you!
Steven