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Q: Why does my engine shake as I accelerate? on 2000 Buick LeSabre

2000 buick lesabre limited and ive had a tune up done, mass sensor, temp sensor, just had a new convertor put on yesterday and it still shakes viciously wen I pull off or excelerate, I can not figure this out. Somebody help me
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Thts possible cause after I got the convertor put on they said I need a tune up, but I had 1 done last month
Yes, but tht may be because they did not erase the code after the convertor was put on! Could a crankshaft position sensor be a possible reason?
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