What causes very rough idle only for 1 minute, when cold?

-there are many things it could be depending on what fuel system the vehicle has (injected or carburetter), age of the vehicle, what brand, model and engine, etc



items like fouled plugs, or fuel system not holding residual pressure, leaking, worn engine,



cold driveability worksheets for GM that highlight some things are found on pages 5,6, and 7 of this manual



http://straighttalkautomotive.com/ebooks鈥?/a>



or this book



http://straighttalkautomotive.com/ebooks鈥?/a>



and for Chrysler, pages10 to 28 with an overview on pg 29



http://straighttalkautomotive.com/ebooks鈥?/a>Need more Data. Could be: idle speed, idle mixture (if it is controllable), choke setting (if you Have one), timing, also some smog widget or airflow sensor going thermal or not working right. You may also have a stuck-open heat riser or AutoThermac (if it's a GM.)
Welcome !



What are you working on ? Year, Make, and Model Please???



Master Tech Lee



http://www.fixcar1.com
Oil gets very thick when cold, so that could be it if ur lucky. If ur unlucky there could be a list of possible problems.
service