I own an 88 Pontiac Firebird, it's a v8, Fuel Injected, 5.0 L Formula. Now, i have noticed for quite a bit that it's not having the acceleration a V8 should have, and was wondering what can be some causes to it? I know that there can be plenty of reasons, but i'm not amazingly car savvy. I haven't given it a tune-up, and that has been suggested, and I am sure I have a small leak in the exhaust manifold. Serious answers are greatly appreciated. Thank you.