hello i have just purchased a 1995 dodge ram with the 5.2L as soon as we left and the engine warmed up it started to idle rought and die if you were in drive and stoped. as long as you were driving it ran great. i came home and let it sit and while it was cool it ran fine but when it hit 180 degree or so it would start to run bad again. i checked all the vacum lines an it has plenty of fuel pressure. can any one help me out. Thanks

 

return it.

 

Check o2 sensor.

 

You may want to check the engine coolant sensor.

 

Check the oil level. If you have a plennum leak you may have low oil level.

 

Idle air control motor (IAC) on the throttle body may be dirty. Give your tb a good cleaning.

 

+1 on the IAC. I was having a similar problem.
I cleaned the TB, IAC and theTPS( Throttle Position Sensor )as well.
I ended up replacing the IAC andit seems to be OK now.

 

Try Rabbler's suggestion. O2 sensor fixedmine.