B18cya00

I ave a 97' JDM ITR motor in my 98 EK.. This problem has happened to me one time before, but after I get passed 2500rpms it kinda sticks n then shoots n goes fast.. Before it was the plugs n wires n I just replaced both 5000 miles ago n just bought new plugs the other day n it still occurs a little bit! I heard it was one a plug under my TB! Idk what it could be but I know its less than $150 to fix! Please Help!