RPM surges when clutch is pressed in

[BobboVr4]

I own a 91 Galant VR4 and have posted this problem to other sights, but want to see if anyone else has any advice. Well, this problem happened just the other day when I was driving on a side street. I shift gears and when I press in the clutch, the RPM would surge to 3500 - 4000 (depending on how hard I step on the gas). This happens every time I press in the clutch. I have replaced my caps in my ECU, ACT 2100 installed this past summer, K&N filter, removed wastegate selenoid, and just put new NGK plugs with thicker wires from dsmparts.com. This car has not worked as a unit at all, since I got the car about a year and a half ago! Any help would be GREATLY appreciated.

 

[BobboVr4]

To clear any confusion, what I meant to say on pressing on the gas part was how hard I pressed on it before I pressed on the clutch. Not at the same time. SORRY!

 

[2FastTSiAWD]

Mine does this too. I just replaced everything that he said, does anyone know whats going on?

 

[Mike1992]

ISC maybe?