[LSX-Nation]

Actually after just using it i just remembered that way back when i bought the car the speedo was off and i adjusted it using the predator tuner that came with the car then i threw it back in the box lol, I think i used the factory tune and just calibrated the car for the gears. Maybe the person who sold it to me threw the factory tune back in before selling it??? idk but anyways im pretty sure the stock tune is in so what should i do? Could a stock tune throw off the timing? The MAF is aftermarket im not sure if that could be the problem or not haha thanks.