09-01-2009, 12:30 PM
Join Date: Jul 2004
Location: Northern Virginia
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Could be a number of things causing that. From fouled or worn sparkplugs, to bad gasoline, to vacuum leaks, various sensors, electrical issues, running oil that is too viscous (some motor oils get thicker the longer they sit in the crankcase, some shear down very quickly), more etc.
For your model year, there is also a MAF and IAT sensor in the air box (air filter cover). Given 156K KM on the clock, could be a dirty throttle body and/or dirty MAF sensor that is causing this initial stumbling. Many have reported much smoother, even idle when these are cleaned. This is also assuming that there is nothing else causing this issue.
Might be a case of just need a good tune up to fix the stumbling idle at cold temps.
2002 Toyota Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Toyota Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Toyota Matrix XRS, 2.4L 2AZ-FE VVT-i
2009 Toyota RAV4 Limited, 2.5L 2AR-FE Dual VVT-i