how are you ,sorry you having this problem
1- If the spark plug & coil been changed , then we need to check the injector # 1 P0301 misfire #1 ,if the injector is firing on that cylinder?
2- do a compression test on cylinder #1 that code keep coming back
3- we need to check the fuel pressure ,to see up to specs
4- can you get me fuel trims reading , short term & long term fuel trim readings.
5- Vacuum leak around the intake especially where #1 is to see if you are sucking air there & causing the misfire
it look like they dont know the cause of it, they looked at p0301 & decided ok misfire on #1 change the plugs & wires ,but that did not solve it
so they are stuck ,do they have capable scanners ,from what you know
Please let me know
ASE Certified Technician