2003 civic si.
So my problem is, when going through 1st, 2nd and 3rd ill give it full throttle, but it doesn't pick up immediately. It kinda lags before I actually pick up spee.

The car struggles to gain speed when flooring it from a low rom. The car will rev and the rpms will go up, but it'll take a second or 2 to actually pick up how it normally does.

But it doesn't happen when driving normally on low rpms.

I know this is kinda vague, but hopefully someone knows what I'm talking about.

any thoughts?
thanks

 

My guess would be that the clutch is slipping.