John,

I have a very similar problem as the the one you describe. One thing that I notice is that when the 'stumble' occurs, if I floor or nearly floor the accelerator, it accelerates normally. Also, I replaced the Temp II sensor which made no difference.

Patrick Spragge

> On Dec 6, 2016, at 10:00 AM, John Goubeaux <john@UCSB.EDU> wrote:
> 
> Yes, that connector IS on and tight and is a pretty tight fitting one
> but maybe it is worn?   The  AFM was recently replaced with a rebuilt
> one too.
> 
> The fact that the issue has always gone away after the engine warms up,
> eg warm up cycle, seems to point to coolant sensor or it's circuit I
> believe.
> 
> -john
> 
> 
>> On 12/6/16 9:53 AM, Dan N wrote:
>> /"stumble and run rich on accelerating at some point soon afterward"/
>> 
>> this symptom is very similar to when I forgot to put the connector
>> back on the AFM...
>> 
>> could that connector be worn and not giving a tight connection?