# Chevy S-10 takes off at 20 mph without touching the gas **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, s-10\ **Created:** [August 24, 2019, 10:05pm UTC](https://community.cartalk.com/t/chevy-s-10-takes-off-at-20-mph-without-touching-the-gas/147409 "2019-08-24T22:05:00Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Bill58](https://avatars.discourse-cdn.com/v4/letter/b/dc4da7/32.png) [@Bill58](https://community.cartalk.com/u/Bill58)\ **Post date:** [August 24, 2019, 10:05pm UTC](https://community.cartalk.com/t/chevy-s-10-takes-off-at-20-mph-without-touching-the-gas/147409/1 "2019-08-24T22:05:00Z")
i own 1994 s-10 and when i start it up and put it in drive, it takes off at about 20 mph without me touching the gas pedal. It is not a carburetor problem. We don’t know why it does this. We have been told that it might be a transmission problem. Do you have an answer to this problem? ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [August 24, 2019, 10:35pm UTC](https://community.cartalk.com/t/chevy-s-10-takes-off-at-20-mph-without-touching-the-gas/147409/2 "2019-08-24T22:35:24Z")
It can’t be a carbutetor problem since you don’t have one. Is the check engine light on? What engine? By takes off… do you mean that the idle speed is very high? ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [August 25, 2019, 4:44pm UTC](https://community.cartalk.com/t/chevy-s-10-takes-off-at-20-mph-without-touching-the-gas/147409/3 "2019-08-25T16:44:18Z")
What speed does motor idle in park? 800rpm? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [August 25, 2019, 5:10pm UTC](https://community.cartalk.com/t/chevy-s-10-takes-off-at-20-mph-without-touching-the-gas/147409/4 "2019-08-25T17:10:12Z")
Anytime I hear this complaint, the first thing I check is if there’s a problem with the Idle Air Control valve. [https://www.rockauto.com/en/catalog/chevrolet,1994,s10+pickup,4.3l+v6,1061020,fuel+&+air,idle+air+control+(iac)+valve,6072](https://www.rockauto.com/en/catalog/chevrolet,1994,s10+pickup,4.3l+v6,1061020,fuel+&+air,idle+air+control+(iac)+valve,6072) Tester ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [August 25, 2019, 7:18pm UTC](https://community.cartalk.com/t/chevy-s-10-takes-off-at-20-mph-without-touching-the-gas/147409/5 "2019-08-25T19:18:45Z")
If the warm idle rpm is too high, suspect the idle air control gadget, throttle valve sticking, or big vacuum leak. One caution: Engines of that era often have a little air-bleed screw on the throttle body to adjust the idle rpm as part of a tune up. Don’t try to fix this problem by adjusting that screw. That’s only for fine-tuning, and if you adjust it to correct another problem the engine will never run correctly. As for the transmission-involvment theory, first off do you have a manual or automatic transmission?