I have a 2013 ford focus at a stop sign/light when I press the gas pedal it acts like it cuts out then goes. it only has 22000 miles
it doesn't happen all the time. last oil change had the air filter changed. it was acting bad right after last fill up. I put in a bottle of heet in the gas tank. it was okay, then started again some times. I am putting 78 octance fuel in it