Warm the engine, then shut it off. Disconnect the wire to the valve at the valve itself. With engine still warm, start the engine, it should idle reasonably smoothly. If not, you have another problem.

Check the idle at this time. Should be 900 rpm. If not, you may have to adjust the idle. DO NOT try to adjust the idle with the idle stabilizer connected.

Now shut down again ( this clears the computer), reconnect and start up again. Compare the performance. Any negative change.? Rough running, etc. Idle stabilizer valve.

The valve is really intended to help on cold starts, and low idle but sometimes they get a bit crotchety. You may have to lean it, or at worst, replace it. On the 1.9L  WBX they are fairly cheap, but on the 2.1's they are a bit pricey.

Good Luck.

John Rodgers
88 GL Driver.
 
 

Kim Gallant wrote:

I have had my van for 5 years now, and I cannot sit in traffic with it.  It
won't stay running for longer than about 10 minutes, especially in the heat.
Does anyone know where to start to fix this gremlin problem?  It seems like
my van is getting too much fuel and dogging out.  Normally , just driving
around it works fine.
thanks.