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Having occasional stumbling and stalling. Usually within 5 minutes of start up. One stall and its usually fine for the day. If i keep my foot on the gas it will get past the stumble. History of vehicle: 79 gle . 84 engine and 5 speed. Just about everything on this car has been replaced with in last couple years. Exception being the fuel pump . Head/valve job last year. All tune up items are new. Warm up regulator? Thanks in advance
 

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The Lambda system sets the mixture according to information from the O2 sensor (within a narrow range).
The setting is expressed in Pulse Relations or Duty Cycle. It must be in its working range.
The other thing is a Pressure Impulse Contact.
 

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The WUR can be the culprit, but also check the AAV is working right - it's just like the AIC on a 16V car but doesnt have an 'ecu control' function as it's simply a two-wire device. It's interesting that 8V cars in some markets got lambda and some didn't.
 
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