DEFIAYELY CHECK FOR A VACUUM LEAK. ALSO CHECK THROTTLE POSITION SENSOR AND IDLE AIR CONTROL.IF EQUIPPED. GOOD LUCK
If the idle speed is VERY high (over 1000 rpm), check for broken vacuum hoses first, then check the EGR. Sometimes the EGR sensor assembly plastic becomes brittle and breaks, leaving a wide open hole into the intake.
Sadly, a common problem with these mid-90s Buicks is a cracked intake manifold. Did the car overheat recently? If so, have the intake manifold checked for a crack.
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