"Carb and choke cleaner" comes in spray cans to clean out the inside of carburetors and choke assemblies on vehicles with carburetors, carbs tend of get varnish down the throat and the chokes would end up full of rust and carbon which should eventually cause the choke to seize in place.
Fast-forward a decade and the same stuff is good for cleaning out the insides of EGR valve assemblies, on the Esteem take the EGR valve off and heavily spray out in inside of both holes then scrub it out with a bottle (test tube) brush and then spray it out some more until you have removed as much carbon as you can.
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