2003 Mitsubishi Galant Q&A

2003 Mitsubishi Galant Question: high engine rev

when I first start engine the engine revs up for about to 1700 rpm for about 2 to 3 minutes and then starts to rev down to a normal rev. My mechanic has not been to identify issue. -
Answer 1
Hi Ebony, Did you every get this resolved? Do you know if there were any diagnostic fault codes stored? -