Sound like vacuum leak check replace all old vacuum hoses replace pcv make sure its getting vacuum.make sure spark plugs and wires been replaced.replace fuel filter and air filter clean fuel injectors.code scan for faulty idle air control valve.but do a little tune up see if that helps.most time if i have problems with vechicle i do a tune up make sure engine getting good airflow.plenty of fuel and good spark.i will do a three stage trouble shooting before i find something major wrong with engine.
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