Bad Gas?

[jazzyj13]

Hello all I've got an '01 4.4 with 61K, I live in NY. I was in NJ yesterday I had 1/2 a tank of gas and decided to top off the tank, the prices in NY for BP 93 are about $4.27, in NJ the BP station I passed had it for $3.87 no brainer. Drove home no issues, today I started out and about 20 min into the ride the car started sputtering, almost like it was coughing, when I would come to a stop. I thought it was the trans but it kept happening when I put it in neutral or park but not as bad. Called my mechanic and he said it might be you got some bad gas, he advised I put in a bottle of Techron and 8 oz of Marvel Miracle oil. Took about 1 mile of driving and the coughing totally went away upon stopping, but when I would really give it some gas it felt bogged down and my service engine soon light started blinking and then went away, this happened once before and I needed to replace the coil on cylinder 8. After the blinking SES went away the car felt fine but every once in a while it would happen again when I stepped on it. Bringing it in tomorrow any thoughts.