I have had the Vanagon syndrome before and had corrected it by all the below suggestions about 80k miles ago. I wonder why it happens only at 3300-3400 rpms. I drove my Westy camper 200 miles home at 3200 rpms or below and it didn't do it. Wouldn't this also suggest a failing coil? 

Dennis Jowell
Scotch Hollow Farm
Newbury, Vermont 

> On Aug 27, 2017, at 1:14 PM, David McNeely <davmcneely40@GMAIL.COM> wrote:
> 
> When I bought my 1991 Volkswagen Vanagon GL Campmobile with 2.1 waterboxer,
> it had severe hiccups, which were intermittent and hadn't shown up in my
> test drives or to the mechanic who inspected it for me.  When the hiccups
> did show up, I took it to a good Vanagon mechanic.  He did all the standard
> tune up procedures, plus grounds, connections, AFM replacement (not that
> expensive).  In the 50K miles I've driven it, it has never hiccuped.
> Solid, standard maintenance works wonders.
> 
> mcneely
> 
>> On Sun, Aug 27, 2017 at 8:35 AM, Dan N <dn92610@gmail.com> wrote:
>> 
>> I read somewhere on the net that the AFM harness does not solved all the
>> hiccup problems because there are problems very similar .... I'd suggest
>> the followings:
>> 
>> - check and clean the AFM connector
>> - clean all the grounds in the engine bay
>> - the ignition switch could be involved too ... so it's a good idea to get
>> a new one to rule it out
>> - check the wiring on the distributor
>>