Thanks,  which ground connection would be the likely culprit ? Ground at
the ECU ?  This is a tough problem given it has been VERY infrequent.

I know there are a couple of grounds in the engine compartment to the
engine case, one from the distributor as well as a strap from the wiring
harness area on the LH to the engine case.

-john

On 12/5/16 2:47 PM, Stacy Schneider wrote:
>     Check and clean your grounds first.
>
>                                                                        Stacy
>
> On Mon, Dec 5, 2016 at 2:18 PM, John Goubeaux <john@ucsb.edu> wrote:
>
>> Hi Guys,
>>
>> 90 2.2 gowesty engine
>>
>> I've experienced an intermittent running rich / loading up condition
>> condition. When I say intermittent, I've seen it say 4 times in the last
>> 2 months.
>>
>> It's always been on the warmup cycle after startup where the car starts
>> fine, idles OK but begins to stumble and run rich on accelerating at
>> some point soon afterward.
>> It eventually goes away after the engine runs a while and warms up. The
>> last time it happened, yesterday morning the car stalled and would not
>> start.
>> I left it off and re-tried after 10-15 minutes and it started right up
>> and the issue went away.
>>
>> Because this condition has been infrequent, I've not put much thought
>> into it BUT am now considering the " Temp II "  coolant temp sensor to
>> be the potential problem source.
>>
>> Am I correct in assuming that this is the likely root of the issue,
>> maybe sending the ECU some out of bounds values ?
>>
>> Should I replace it altogether, or clean the contacts and maybe add some
>> dielectric grease ?
>>
>> Thanks for any input.
>>
>> -john
>>
>
>
> --
>     1989 Swedish Tristar with Aluminum gates and Atiwe 16" Wheels.
>      Oldest son is an Eagle scout.