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they said something about an issue with engine imbalance and they would need it for a full day and I could drive it the few days in between. They have now had it for 1.5 days and called me to say its running "better" that the spark plugs were fouled and then questioned if I had been putting premium in.
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Smells cattle excrement they feed to their average customer so they can charge what they want. Fouled spark plugs stopped being common 5 years before I was born. Ask for the code that was stored on the ECU that caused the check engine light. There is zero reason why they should deny giving you that number. If they don't have it then they can't fix a problem they aren't aware of and are, again, bullshitting you by keeping your car if they aren't doing anything about it.
For background fouled spark plugs mean that the air fuel ratio is incorrect, this is tightly controlled by your ECU, O2 sensors, timing and fuel injection systems. If your spark plugs are fouled and they aren't replacing or changing one of those things they're either feeding you bullshit or being lazy about fixing it. For any one of those things to go bad before 150k miles on a modern car at the earliest is nearly unheard of.
Throttle body and injector cleaning are snake oil.