Let me offer vacuum. My guess jostling of the air into the mixture. Makes me wonder are the new injectors properly sealed/seated. 

That is my only guess

Gl
Tony

Sent from my iPhone

On Sep 26, 2013, at 7:34 PM, John Meeks <vanagon@GMAIL.COM> wrote:

> I'm gonna guess an FI connector is loose/corroded or a wire to an injector
> is broken under the insulation and intermittent.
> On Sep 26, 2013 5:02 PM, "Skip" <skiplaubach@comcast.net> wrote:
> 
>> Update:  Drove at lunch today and the engine ran beautifully.  Did notice
>> when I drove over a rough railroad crossing that the van immediately
>> started bucking.
>> 
>> My diagnosis (not validated) is either a fuel pumping interruption (from
>> the bumps) or the ECU gets "confused" when jostled over bumps or the AFM
>> gets whacky from the bumps.  The ride smoothed out less than 100 yards
>> beyond the crossing.
>> 
>> The difference between this morning and lunchtime runnability was
>> incredibly large.  I think the fact that runnability is not consistent is a
>> data point.
>> 
>> Anyone hazard to provide a root cause?
>> 
>> Skip
>> 
>> ----- Original Message -----
>> From: Skip
>> To: Vanistas
>> Sent: Thu, 26 Sep 2013 15:33:58 -0000 (UTC)
>> Subject: Digijet rough/wandering idle and bucking at slower speeds
>> 
>> '84 1.9L (with the 2200cc GW upgrade), digijet WBXR
>> 
>> Just installed the Sorensen fuel injectors (w/new seals) on Sunday.  Made
>> in America.  On sale at a FLAPS (local A-Z).  Noticed an improved smooth
>> idle and acceleration immediately versus my (recently cleaned OE FI's.  I
>> had to fiddle with my idle versus the OE FI's.  The Sorensen FI is a "disk"
>> versus the OE, which is a "pistel" type FI.  Some recent chatter on
>> thesamba about these.
>> 
>> Then, I drove my Westy to work this morning.
>> 
>> The idle was rough and wandering, in fact the
>> engine died a couple of times at stoplights (started right back up,
>> fortunately).  Some bucking in 2nd and 3rd gear.  Wondering about a
>> vacuum leak, timing, O2 sensor, fuel filter, fuel pump, ECU.  I can put my
>> hand on the problem but never my finger...
>> 
>> I'm leaning toward a vacuum leak and more work on idle adjustment.
>> 
>> Ideas?  Thanks.
>> 
>> Skip
>>