"Is this something I should take to the shop?"
You know this is the reason we get the big bucks (bg). I just have to grin at those that replace half the car with parts changing diagnosis. Not that I haven't changed a few parts to achieve a diagnosis, but my customers never pay for any more than what it takes to solve the problem. We call it the "Blue car syndrome", you know; if its a blue car then it must need a coil (bg).
Bosch Master, ASE Master, L1
33 years MB technician