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TUNING HELP!

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8
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4
Location
Whittier California
#1
Hey guys!
I purchased a pre modded and tuned car.
Car has downpipe, intake, exhaust and intercooler.

Not sure who the car was tuned by but I recently switched out the spark plugs to NGK +1 colder that were recommended to me and now the car runs extremely rough, haven’t driven it yet but now purchasing a accessport and looking for a tune.
Any help or recommendations on what to do?
 


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