rough idle in the morning

[mattrick8888]

ok i need help i am at a loss for ideas of what to do. i did a search but couldnt find a thread on what is happening to my truck. after my truck sits over night and i go to start it, it immediately idles rough and seems to stumble. it holds at about 1000 rpm but is not smooth at all. after about 10-20 seconds it smooths out and is fine until the next day when i start it again. this truck is used offroad alot and in dusty conditions so i tried cleaning the mas air sensor and the iac but it didnt help any. i read some threads about the ECT and the thermostat so i went ahead and changed both of those but there was no improvment. i pulled the code yesterday and nothing came up. i am going to try changing the plugs next, does this sound like a logical step?

2000 ford ranger, 44,000 miles, 4.0 auto.

 

[cjbarron5]

mine does the same thing and plugs and wires didnt do the trick not to say it wont on yours im thinking its the iac or o2 sensors

 

[WillieTD]

IAC and changing the plugs would be a good idea if you haven't changed them in a long time. You can get a new IAC on www.fordpartsnetwork.com for about $50.

 

[mattrick8888]

would a bad iac or o2 sensor throw a code?

 

[cjbarron5]

not all the time also check or change the temp sensor for the computer