Is my car fucked?

So my car burns a lot of oil due to high miles and I do DoorDash lately for a trip and I added oil this morning and I went through a drive through to pick up the food and my car was sputtering badly and I checked the oil none on there added some and then check engine light on and FLASHING. Unfortunately. Had to drive the car to give people there food while it was like that then said fuck it and turned it off cause I knew it was bad. Had a tow truck drop my car off at the shop. Is my car super screwed? The car was sputtering bad while driving and check engine light flashing then solid for a bit then back to flashing.
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They said engine is fine, spark plugs had oil on them replaced those and did an oil change and said spark plugs cause a misfire. But I don't know
Is my car fucked?
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