Q: Random misfire cylinder 123

I'm having a problem with my Audi with random misfire in cylinders 123 I just bought the car it's been sitting in the dealer for about a month or so I started car check engine light is on, it says inspection is due , I got a oil change including oil filter new, car ran smoother throughout the week car has been performing kind of odd the check engine light stays on and flashed at certain times when car is on , the car started shaking like it was about to turn of but it didn't on my way home from work, I took it to a local mechanic they said it was the coils so I bought 4 new coils and spark plugs thinking the problem would stop but it didn't car still shaking at random moments of the day so I payed 450 for that a waste, I took it to another mechanic for foreign cars they're telling me it could possibly be the fuel injectors the car feels weak and the car sometimes in the morning won't start until I hit the gas then it cranks up I got a fuel system cleaning shake stopped but cel light on

My car has 88000 miles.
My car has an automatic transmission.