I have a 2005 honda civic, and my brother a 2004.  Both cars hesitate at low
speeds when its cold outside.  Going from a dead stop its like your gasing,
letting go of the gas for a second, then gassing again.  This only lasts for
the first few minutes while the car is cold.  The colder it is outside, the
longer it lasts.  My previous car was a 2003 honda civic, which did not have
this problem.

Any ideas?

Would buying one of those "performance chips" (resistors) possibly make any
difference?

Thanks