My truck has 125,000 miles on it and it seemed to run great until last week. When i try to start the truck, it will turn over, but then stalls. If i hold my foot on the gas, it will stay running, but as soon as i take my foot of the pedal it stalls. When i do keep it running by holding down on the gas, the check engine light does NOT come on, so i dont' think it will throw any codes.
What order of parts would you start replacing?

 

It sounds to me like the Idle Speed Motor is bad. I'm not sure the location as I haven't had to replace mine but it should be somewhere near the intake tube/manifold connection. You'll have to remove the plastic cover over the intake manifold.

Mike

 

An update is that this morning i held the gas pedal down for about 15 minutes and when the truck warmed up, it idled correctly then. Soo, it seems to be a cold weather problem. Should i maybe clean/replace the IAC Valve first?

 

take off the i.a.c. clean it good see what happens. i have a 97 with 128k had same problem few weels ago. cleaned i.a.c, she runs great now