Why is my car vibrating while on idle and shaking while driving?

art

New member
hello everyone, I picked up my car from the mechanic yesterday, he changed my timing belt, I have a 2000 Mitsubishi Galant ES automatic transmission. Today I was driving it and I noticed the car was slightly vibrating while on a stop sign or a red light but then I was driving it at like 20-30mph and it started shaking, there was a dunkin donuts on the side of the road so I turned it off and waited for a few mins then drove it back home and thank god it didn't shake while driving it again. I'm wondering what could it be, maybe he didn't adjust the timing belt correctly or could it be something more serious? I hope not!!!

All answers appreciated, thank you very much
Oh and by the way the vibrating while on idle did it before but the shaking while driving is completely new
 
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