I had a similar problem with a 500 coupe of similar vintage, turned out to be a throttle control module, cost 800$ installed at the dealer, part was 400 or so. although on mine the asr light came on and would reset afte restart and then go on again

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2007 GL 450 alabaster white, macadamia leather, Premium I, plus lots 0 goodies
2006 Dodge CTD 2500 Megacab Laramie
1996 Mitsu eclipse spyder Conv