strange behavior

  1. N

    technical help please 95 5.0 at the end of my rope lol

    Hi i have a 95 mustang vert 5.0 H.O. 5spd idle is erratic sometimes it idles 650 to 700rpm perfectly smooth then randomly starts surging up and down then sometimes it will race up to 2000rpm without touching anything stay there for 30 seconds or so then fall back down and start surging again...