Cold start issue

Thanks for all the help on my brake question-- now one on cold starting:
'07 EX-L V6 sedan, 45,000 miles, garaged, fully maintained per owner's manual and maintenance minder.
Starting about a year ago-- on cold start (winter or summer), the car starts immediately and runs smoothly. But I live at the bottom of a long, steep hill and when I drive up it, the car sorta' chugs and the automatic transmission seems to be upshifting too soon. I'm thinking the engine is straining. If I hold it in a lower gear it doesn't seem to do it.
Once the car warms up, it pulls fine up the hill.
Ideas?
--
"...William Munny, a known thief and murderer, a man of notoriously
vicious and intemperate disposition."
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William Munny wrote:

You'd really need two identical cars to see if that's even abnormal. I used to live in a very hilly region, and even in brand new cars I usually shifted manually. That's why the shifters still have that option....no vehicle can be 100% tested for every possible situation. GW
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On 6/2/13 5:05 PM, Geoff Welsh wrote:

OK, thanks-- but as this only started about a year ago, I'm thinking it's not normal...
--
"...William Munny, a known thief and murderer, a man of notoriously
vicious and intemperate disposition."
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