94 gt rough idle runs rich

[kingslowbra94]

hey guys i have a 94 sn95 gt that has a rough idle and runs a little rich. i have a check engine light that lights come on every once and a while after i shift into second gear and around 50 mph and goes off. if im sitting a light for too long my rpms drop and starts loping. :/ any suggestions ?

 

[96laseredcobra]

Check iac valve

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[speedline]

Vacuum leak can cause this also. Best check codes if lamp has come one.