Passing on experience and repair tips

Hey guys I need your help with my 2010 fx35, I got my timing chain changed and after I did it when I come to a full stop then take my foot off the break it accelerates on its own, that’s problem #1 then the other problem is my speedometer bounces up and down when coming to a stop, not all the time but once in a while can you guys tell me what to do?
 
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