2001 voyager hesitates.

[blade007]

Hi all. I have a 2001 vouager with 79000 miles. On mornings when I start and drive before warming up properly the van kinna hesitates and sounds like it misses a little. When it is warm it works just fine. I reciently changed the sparkplugs and air filter and engine oil before I took it for inspection. I did not change the spark plug wires but I doubt that is the reason cause it works fine while hot. I just changed the transmission fluid.
Any ideas would be helpful. Thanks

[who fan]

Check the EGR valve and oxygen senser. If the spark plug wires are original they could be the cause.

[blade007]

I'll look into this. Would putting a code tester on it help even though I don't have a check engine light on? Also, not to sound like a moron, but what is the EGR Valve?

[blade007]

Also, This is my first time owning a kind of new car. My last one was a 1996 caravan. Does anyone know what is the standard warranty and where I can find out what is covered by the drive train warranty? i read somewhere that it is supposed to be 7 years or 100000 miles.
Tks