Ever since I put my car back together it wasnt running right so I took it to a shop. Ends up that some of my injectors were bad and I had a cracked spark plug. Anyway AFR reccomends using autolite 3924 plugs and they used motorcraft plugs when they replaced them. Do you think this is affecting power or should I not worry about it. The car only dynod 280 to the wheels and to me I expected a little more but maybe im wrong.