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Slightly rough idle


New member
Buick Ownership
1993 buick park avenue
How folks. Looked at a 1993 buick park avenue ultra(supercharged) today. It ran great but has a rough idle which he said gets worse if you dont use premium fuel. I dont want to buy it if it's a stuck valve or something. Anyone have any clues? It has 52k on it


Full Member
Southern Utah
Buick Ownership
2003 Park Avenue Ultra
It is supercharged, it needs premium fuel to control detonation. The supercharged heats the air significantly. The factory computer will do everything it can to keep the engine running on lesser gas, but you get rough idles, decreased power, and other issues from it.
Pedal Commander