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Discussion Starter #1
I have a 1990 Seville with 111,000 miles on it. It runs terible wont accelerate past 60 miles per hour on highway. I have had it in to two different shops, one said it was a valve issue to much carbon build up. Second one said not the valves it was a vaccum problem, all the cylinders have really good compression saya it might be carbon build up in the intake. Any help would be great.

Todd
 

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1996 STS (181,000) Arnott Struts, 245/45/ZR18, 1" Drop -SOLD
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1,589 Posts
Does the thing have a throttle body you can clean out?
 
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