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Originally Posted by wymi
I had the exact same symptom on my 01 Malibu, it was the IAT sensor harness and plug assembly that went bad. It's about $20.00 at the dealer, easy to replace. You will probably get a code for the IAT sensor at some point, I did and changed the sensor, same problem, then I changed the IAT wire harness and plug assembly and all is well.
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Well, you may be on to something. I noticed the other day that my check engine bulb was blown, so I replaced it. It immediately lit and told me something was wrong (DUH!) so I plugged it up to my OBD scanner. P0113 was what I got, which is a high IAT sensor reading. Well, I replaced the IAT sensor, reset the code and the light was off for about 60 miles. On the way home from the store tonight, the light came back on. I got home and, you guessed it, P0113 again. I may try the harness next.
Could something as simple as the IAT code cause the hard shifts? I can see where the hard shifts during driving might occur, but I don't think that it would cause the hard shifts (lurches) when shifting into R or D when coming out of P or N. I think that I may still have issues, but I'll work them one at a time and see what happens.