Rough Idle Due to EGR Valve Sticking Open on Cadillac Seville STS

The EGR valve may stick open, causing a rough idle and/or the Check Engine Light to illuminate.

RepairPal Verified
Average mileage: 126,328 (105,986–148,000)
11 model years affected: 1993, 1994, 1995, 1996, more1997, 1998, 1999, 2000, 2001, 2002, 2003
16 people reported this problem
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problem details
1996 Cadillac Seville STS 105,986 mi,
rough idle and missing on take off and when i press gas
1998 Cadillac Seville STS 125,000 mi,
Idles up and down at times. Sometimes hard starting when cold, msut press gas when starting like one of my "old" carb. cars.