Here's a wacky problem that started about 1000 miles ago. When warmed up at idle in 'drive', my 98 V10 E350 will surge as in engine cutting out and then catching itself and leaping ahead or just rocking like AC-DC is playing live in the back of the van.

I had a prior problem of the engine dying on heavy braking where the trans didn't seem to downshift fast enough-that's been 90% corrected.

I wonder if this is a common problem and what 'module' controls the idling. I'll try some FI cleaner but it feels more electrical than fuel delivery BUT could maybe be a fuel pump issue.

If I hld the idle just slightly higher off idle in drive at a stop-it vanishes...

 

"Surging" only mentioned 191 posts on in this forum. Have you cleaned your MAF and IAC? I would start by checking them to make sure they are clean.

 

I searched a couple of them but nothing like these symptoms. I should make a short vid of this thing dancing at a red light-everyone looks for the 'van's a rockin...' in the back picture windows.

 

My v10 did that too. Vacuum leak at the pcv hose on the throttle body

 

Awesome, sounds like $10 & not $1000 for once....

 

All I had to do was get the old hose off and replace it

 

Could be a couple things.. When you say dancing, is it more like a regular idle, and then drop down to about 350 and shutter, and back up to regular (repeatedly) accompanied by any dieing in Drive/Reverse? Does it die when wheels are fully turned left/right?

Has there been any check for vacuum leaks, cracked pcv, egr, egr tube?
Cleaned MAF, IAC or throttle body?

 

You all did notice the 02-22-2012, 12:16 PM on the last post from the OP? I am sure the OP has it fixed by now although a follow up fix would have been nice.