# Speedometer bouncing with rough idle

**URL:** <https://community.cartalk.com/t/speedometer-bouncing-with-rough-idle/23285>\
**Category:** Maintenance/Repairs\
**Tags:** electrical-wiring\
**Created:** [December 11, 2008, 8:18pm UTC](https://community.cartalk.com/t/speedometer-bouncing-with-rough-idle/23285 "2008-12-11T20:18:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![largemike100](https://avatars.discourse-cdn.com/v4/letter/l/82dd89/32.png) [@largemike100](https://community.cartalk.com/u/largemike100)\
**Post date:** [December 11, 2008, 8:18pm UTC](https://community.cartalk.com/t/speedometer-bouncing-with-rough-idle/23285/1 "2008-12-11T20:18:12Z")

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I have a 2003 Ford Taurus V6 OHV. I noticed over the last 4 months that at intersections or when parked the speedometer bounces all over the place as well as a rough idle. Also while this is happening, if I turn on the defroster, A/C and sometimes the head lights the car shuts off immediately. I got my car tuned up around 6 months ago. Ford tells me faulty spark plug wires but can’t confirm a diagnostic test on my car because this issue doesn’t happen consistently with no “check engine light”. I want to be sure it is not just a electrical short some where.