I have a 2002 Mustang Gt with a new Ford Racing intake manifold, SR Performance cold air intake, and flow masters. I've just replaced all the spark plugs and the intake manifold. Ive noticed that the acceleration is not what it should be. it is worst than what it used to be. The RPMS aren't rising fast until it hits 4700 then it lights up. I'm unsure what the problem could be. I know the acceleration used to be so much greater and for some reason it's just not there anymore. Any ideas?