engine build time

Nissan370

dude i am so pissed right now its not funny
i got the car back today and 30min after picking it up the car is missing like crazy
i was charged 500 bucks for some valve and labor to day before i got the car back
valve was sticking open or something kind hard to believe since the car only has 34k miles on it but i paid it

driving down the street and out of no were the car is missing like crazy i dont know if i want to go back and complain and give them a few days to fix the problem or go to nissan have them fix the car and try and get the shop to pay the difference or get a court to do it
my wife is pissed even more then i am.

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370z vsr motorsports single turbo/built motor 9.1cr 525rwhp/450rwtq @ 10.5psi (stock maf maxed out)