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at a good car wash, or you can even do it in your driveway
carb cleaner or brake parts cleaner
Its at the rear of the engine in the intake manifold. Take the 2 bolts off that hold it and clean all of the carbon before installing the new one.
You buy a new egr valve for about $300.00 or take the old one apart and clean it. It fixed my 1990 3800 lesabre.
clean out or replace the throttle body spacer...
Start at the battery. Remove and clean all connections. If the battery is over 3 years old you probably need to replace it. Can also be a starter going bad.
the egr valve is located on the top of the left side of the engine. it is a round canister looking thing with wires going to it and it bolts directly to the engine. it cannot be cleaned. it either works or it doesnt in wich case ti would need to be replaced. if the engine has been running it can be VERY HOT.
Doesn't a 94 Buick have Throttle Body Injection? Try running injector cleaner through the fuel system first. As always, follow the manufacturers recomendations.
Clean the MAF and throttle position sensors.
BELIEVE IT OR NOT, but you don't. the throttle body interior, and throttle plate, is coated with a material to prevent sludge build up. Cleaning it may cause engine performance to decrease.
You can't. It is not adjustable. It is computer controlled. You need to have the engine scanned with an engine scanner. If I was you I would clean the throttle plate real good with an old tooth brush and carb. cleaner until it is shinny and clean. That may just fix your idling problem. UNLESS .... If it has been modified and replaced with a carb you can adjust your idle throttle with the screw located behind the throttle cable, left to increase throttle, right to decrease.
You don't. But you can clean the throttle body with throttle body cleaner. Just follow the directions on the can.