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Here is the repair manual for '92-'96 Toyota Camry and Lexus ES300 in PDF format: http://www.turboninjas.com/camry/ It helped me a lot to do the testing of the EGR system. Pictures DO help! Just follow the procedures chart (you can skip the computer test). Basically, clean the pipes, do vacuum test of you EGR Valve itself and then if it's OK vacuum test the EGR modulator. Most likely you will fond you problem by those simple tests.