Have the tps (throttle position sensor) sensor checked. It could be bad or maybe it just needs to be repositioned. my 92 Buick century idles erracticly and I simply adjust the tps sensor and it idles down but is erractic again once i hit huge bumps in the road. the fast idle solonoid is dirty. Takeit off of the throtle body and clean it. It's located on the back of the throttle body. 2 Phillips screws. Clean the carbon off with throttle body cleaner. And the first answerer needs to fix his or her grammar. Go back and listen in English class. I'd be ashamed.
Anjother possible answer:
Check four prossible lo koolant condishin, or faulty or diskonkted ECT sensor. I is even more ashamded. Vakyoum leaksis are anothear pissibltee.
The fuse box is located in the glove box on 1991 Buick Century
yea it should
My 1991 Buick Century won't move or hold transmission fluid
Yes, on Buick Century 1991 you need to replace the whole hub, it is much easier than replacing individual bearings.
The oil capacity for a 1991 Buick Century 3.3 is approximately 5 quarts. The recommended oil type is 10 W 30.
above the gas pedal, mounted to the steering wheel.
Pressure test system and watch for leak
behind right headlight
My Chilton's Auto Repair Manual shows : For a 1991 Buick Century : ( 15.7 U.S. gallon gas tank )
you have to go in and drop the gas tank... it is on the top