Q: I just put in a new ECM in my 1999 Dodge avenger now it rough idels and shifts hard or lags

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I just put in a new ECM and now when I start car it rough idels or u have to hit gas pedel to keep running. Once going down road it shifts really hard or lags behind . Is there something specific I have to do

My car has 1769006 miles.
My car has an automatic transmission.

V6-2.5L
1999
Avenger
Dodge
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