I have a 94 sonoma 4x4 that when driving, when trying to stop, the engine revs high and it feels like I am giving it gas when I am not. When parked, the engine revs around 2k rpm now instead of around 1k like it was before. Recent problem. Has not thrown a code yet...
possible throttle body issues, high revs and pushing forward when braking on 1994 GMC Sonoma
by alxoli in Loganville, GA on September 15, 2011
ANSWER by Jim Taddei on September 16, 2011
An engine vacuum leak or a sticking idle air control valve would be the most likely cause for a high idle condition on your 1994 GMC Sonoma