The Temp II sensor.  Check that....sounds like it could be faulty despite
replacing it not very recently, as those things go.   They are pretty
touchy  and they are cheap...I'd just swap one in and check the connections
while you are messing around with it.

On Thu, Oct 3, 2013 at 10:23 AM, John Reynolds <transporterjr@yahoo.com>wrote:

> My vans seems to run just a bit off after cruising for an extended period
> of time, say 3 or more hours. Misfire is actually too severe a term; it
> just doesn't seem quite as smooth as it is in the morning. I definitely
> will notice how well the engine runs the next morning on a trip for
> example. Note, my coolant temp is fine.
>
> Van has new NGK plugs, OEM wires, new Bosch rebuilt dizzy and a new Bosch
> coil, as well as recent Bosch cap and rotor, so it seems that the ignition
> system should be A-OK. Timing set per TenCent's method. I checked for
> vacuum leaks, spraying brake cleaner (although engine was cold) and did not
> find any - but I am still think that is a possibility.
>
> The blue coolant temp sensor was replaced 6 years and perhaps 10-15,000
> miles ago.
>
> Any thoughts on what to check?\
>
> John
>