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

by in Potwin, KS on April 05, 2013
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3 answers 2 comments
ANSWER by , April 05, 2013
Ignition misfire, yes i read "tune up".
COMMENT by , April 05, 2013
Thts possible cause after I got the convertor put on they said I need a tune up, but I had 1 done last month
ANSWER by , April 05, 2013
any engine light on?i have seen this problem due to broken or bad engine mounts..
COMMENT by , April 05, 2013
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?
ANSWER by , April 05, 2013
may not be engine. possible issue in drive links. have your drive train inspected.