1991 lx mustang

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Mar 28, 2008 | 02:05 AM

Todd Olson

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Joined: Mar 2008

Posts: 1

1991 lx mustang

I just bought a 1991 LX mustang 4-cyl auto and after warm-up the check engine light comes on and the moter starts to run rough, the guy replaced the ignition module any buddy have an idea what it could be? toddolson45@yahoo.com

Mar 28, 2008 | 07:25 AM

spike_africa

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Joined: Sep 2004

Posts: 11,974

From: Orlando,Florida

I would lean towards the EGR as it only opens once the car is warmed up. And it will do that to your idle when its bad.

Mar 28, 2008 | 10:58 AM

cobra1923

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Joined: Nov 2004

Posts: 660

From: Baltimore

Could be o2 as well

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