killuminatii20
11/14/2007 2:43:18 PM
96 silverado vortec 350....i was just wondering why when my truck is idiling it will idle up for maybe 2 seconds then idle back down for 15 seconds and idle back up for a few seconds and so on.....when its normally idiling it idles at 700rpm and then when it idles up it goes to 1000.....what could that be? its annoying when your at a stop light and it starts moving if u aint got your foot on the brake hard enough...
matador
11/14/2007 3:12:48 PM
Mine is a 06 and at idle it will sometimes surge a 100 rpm or so. I dont notice it in drive. I have wondered the same thing if something is wrong. Yours sounds more serious. It could be just an air flow sensor going bad though.
santaman58
11/16/2007 5:45:12 AM
It might be you TPS sensor...Throttle Positioning Sensor. Easy fix if its that and it isnt too expensive. Had high idle prob on one of my cars and that fixed it.
