Emissions diagram for a Buick 98 3.8 supercharger

Should be at least 35-45 psi.

The replacement of the forward clutch requires the automatic transmission be removed and rebuilt, Cost about $2500.00

Same problem on my 98 Regal GS; remove glove box, locate the blend door actuator, (black odd shaped box with metal "ring"). Remove the box and manually turn the blend door shaft it was attached to. If you get cold air, it's the actuator you removed. About 30-40 dollars.

Please see my tip at http://www.fixya.com/cars/r5973094-starter_replace and let me know if you have questions.

can you give more detail did it start to run rough,how much oil is on the dip stick,does it turn over,????

The ignition module is my second guess,but check the crankshaft sensor first.

the answer here is the forward clutch pack is worn out, in order to replace this umust overhaul the trans.

if serpentine, then it should be on the fan shroud or the radiator cover...

the 3.8" supercharger (belt) pulley? You need a special tool as they are press fit.
www.intence-racing.com and www.3800performance.com

both carry it and offer the tool for rent as well.

Much of the noise comes from the coupler, however there are case (needle) bearings as well that wear, Those are much more difficult to replace.

locate the vacume lines under the top cover(plastic lines) of the engine, then trace them down to the lower front of the engine compartment, you will find the canister, and the solenoid.