1995 Chevrolet G Series Van (G20) Q&A

1995 Chevrolet G Series Van (G20) Question: Jerking in traffic then stalling out does not do it in neutral?

When I have to sit in traffic the van jerks forward like the idle is going up then it stalls out it only does it when its warmed up and when im sitting still.When I drop it in neutral it does not do it in traffic.Im trying to avoid replacing any parts I dont have to.The code scanner I bought will just flash the code 12 hanshake code and thats it.What is going on? -
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