maxwellt91

I have a problem with the idle on my 83 gsl. When my car is sitting with no throttle or choke on my rpm gauge jumps between 750 and 2000 rpm very quickly. The problem is I listen to the engine and it doesn't sound like the rpm is actually fluctuating at all. I read my Haynes manual and I believe it could be the idle speed sensor but I'm not totally sure....