1989 Buick Century Engine hesitation

1989 BUICK CENTURY
75,000 MILES • 6 CYL • FWD • AUTOMATIC
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FASTEDDY5000
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At constant highway speed the engine hesitates which causes the car to jolt fairly violently. It has plenty of acceleration and Idles perfectly. I have changed the plugs,wires and fuel filter but the car still does the same thing. It also has a bad oder coming from the vents. Please help.
Feb 2, 2008 at 3:14 PM
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BMRFIXIT
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[quote:7f45a674ff="fasteddy5000"]Other Category problem
1989 Buick Century 6 cyl Front Wheel Drive Automatic 75000 miles
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At constant highway speed the engine hesitates which causes the car to jolt fairly violently. It has plenty of acceleration and Idles perfectly. I have changed the plugs,wires and fuel filter but the car still does the same thing. It also has a bad oder coming from the vents. Please help.[/quote:7f45a674ff]




Check fuel pressure
check exhaust back pressure
egr operation
Feb 3, 2008 at 5:03 PM
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