# 1999 ford contour runs fine until driving nonstop for more than 2 hours **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [September 9, 2012, 6:01pm UTC](https://community.cartalk.com/t/1999-ford-contour-runs-fine-until-driving-nonstop-for-more-than-2-hours/74552 "2012-09-09T18:01:57Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![byronkirby65](https://avatars.discourse-cdn.com/v4/letter/b/8e7dd6/32.png) [@byronkirby65](https://community.cartalk.com/u/byronkirby65)\ **Post date:** [September 9, 2012, 6:01pm UTC](https://community.cartalk.com/t/1999-ford-contour-runs-fine-until-driving-nonstop-for-more-than-2-hours/74552/1 "2012-09-09T18:01:57Z")
Almost everytime I drive the car for more than 2 consecutive it acts as if it drops a cylinder…running rough … the next day it will run fine until 2 hours go by…and so on I have changed plugs wires and coil pack … any thoughts are helpful 4 cylinder automatic ---
**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\ **Post date:** [September 9, 2012, 8:23pm UTC](https://community.cartalk.com/t/1999-ford-contour-runs-fine-until-driving-nonstop-for-more-than-2-hours/74552/2 "2012-09-09T20:23:59Z")
My first thought is a possible intake manifold air leak or perhaps a faulty O2 sensor. Maybe a MAF sensor possibly or bad engine electrical grounding. See if anything shows up using a vaccuum gauge. ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [September 9, 2012, 8:49pm UTC](https://community.cartalk.com/t/1999-ford-contour-runs-fine-until-driving-nonstop-for-more-than-2-hours/74552/3 "2012-09-09T20:49:08Z")
Fuel filter? weak fuel pump? Does the CEL ever come on?