when I put my foot on gas car won't drive. can reverse only on 2000 Volkswagen Passat

I took it to a local mechanic, and it worked for 1 day but went back to doing the same thing. it jumps into gear when I put it in drive, but it won't move. got code checked and it mentioned something about throttle. what is that?

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2 answers
transmission issue, have transmission checked out...
post code so we can adv