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I have a 91 with 168K on it, have had it since new. Common problem on these was idle air control, which sits toward the front of the engine. usually gets clogged up with carbon and has to be cleaned every couple of years. Comes out easily with two screws and unhook the wires. Clean it of all carbon, then clean the area in manifold as well with injector cleaner spray. If this is carboned up it will idle poorly. Also be sure that the rubber air intake (from air filter to manifold) has NO holes in it. Will hurt performance as well. I recently replaced mine because of a hole in it.
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