Dodge: 1997 ram 2500 v 10, vacuum leak, engine temp

Question
 truck runs great, no engine light or codes but will not idle on its own, drives great as long as accelerator is depressed.  

Answer
HEY CHAD,HAVE YOU HAD IT SCANNED BECAUSE EVEN THOUGH THE ENGINE LIGHT IS NOT ON THERE COULD BE EMISSION CODES IN THE COMPUTER.IF THERE IS NO CODES HAVE SOMEBODY LOOK AT THE LIVE DATA AND SEE IF THERE IS A PARAMETER OFF AND THE COMPUTER IS TRYING TO COMPENSATE FOR A PROBLEM THAT MAY NOT EXIST?(ONE EXAMPLE IS THE ENGINE TEMP SENSOR TELLING THE COMPUTER THAT ITS 50 BELOW ZERO WHEN ITS AT OPERATING TEMP. THIS WOULD CHANGE THE STRATEGY AND FORCE THE COMPUTER TO MAKE ADJUSTMENTS THAT IT DOES NOT NEED)ALSO LOOK FOR A VACUUM LEAK.HOPE ANY OF THIS HELPS CHAD?THANKS,TIM.