: 1993 STS Rough Idle

09-09-05, 09:22 PM
My 1993 Seville STS has a rough idle when warmed up. PCV???

09-09-05, 09:25 PM
Could be anything. Start with a general tune up. Spark plugs, wires, etc.

09-09-05, 10:47 PM
PCV valve is cheap. It should be part of your tune up. Like eldorado1 said, could be alot of things. Any othe problems or more detail?

Welcome to the forum.

09-10-05, 03:34 PM
At 114,000 miles what all does a tune-up entailed?

09-10-05, 05:02 PM
Plugs and wires.

09-10-05, 05:04 PM
Save yourself a lot of grief and use OEM Delco parts.

09-10-05, 06:22 PM
Save yourself a lot of grief and use OEM Delco parts.

Amen. AC-Delco 41-950 plugs and AC-Delco 628Q wire set for your car. The PCV valve is AC-Delco CV774C at about $2.50. Altogether you can get everything for about $150 delivered to your house from www.rockauto.com. Those parts were designed, tested, and made for your car. They'll cost you a few bucks more, but they are known to work well for a long time. Let us know what you do and how it turns out, and welcome to the forum...

09-11-05, 06:08 PM
Many thanks for the much needed info and for your friendly treatment. I will do as you advise and let you know how it turns out. :yup: