1999 E-350 v10 surging at idle and sometimes shutting off at idle

[hershellkoger]

I have a 1999 E-350, 6.8 v10; just rebuit motor; had fuel injectors cleaned while out of the motor; replaced fuel filter; the motor runs fine when driving, but when idling it frequently surges - jumps up 500 rpm for a coulpe of seconds; idles with a lope; not uncommon for it to simply quit running while sitting at a top light. Starts up and goes okay; power is steady under throttle and driving. It was doing this surging/loping before the motor was rebuilt. Anyone have any ideas? Thanks in advance.

Hershell

[maddog 13]

Had a similiar situation with my v10, turned out it was a small vacuum hose that was begining to wear, creating a vacuum break. I believe the v10 has two of these small hoses, one for each bank on the engine (left and right) and that there is also an OBD II code for the situation. I had no problems at full speed (outside of stopped/at idle). Ocurred for a week or so, and then became worse. Replaced the little hose, and its been okay for the last 11K miles (I am currently at 158K miles)

[bkf77]

I would check for vacumm leaks- they are common.

[Heavy_Metal]

Clean the IAC valve, it has been the source of most idle problems since ford started using EFI.

Its on the back side of the intake directly behind the throttle body.