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<E36> Stumbling, backfiring, hesitation

To: BMW List Server    <bmw-digest@domain.elided>

FROM: David Skirzenski      PHONE: 744-4872   ID: SKIRZ                        
Subject: <E36> Stumbling, backfiring, hesitation                               

I've had my '92 325i in to the dealer 4 times for a stumbling,                 
hesitation and backfiring problem with no success.  The dealer                 
has changed the plugs, checked the computer, and changed the O2                
sensor.  The problem only occurs under 2000 RPM at moderate to                 
large throttle openings.  It only occurs after about 1 minute                  
of warm up and usually goes away after 30 minutes of driving.                  
The only thing that ever seems to fix it (temporarily) is when                 
the dealer puts in some sort of fuel treatment.  This problem                  
has been going on for 6 months (through many, many tanks of                    
different gas brands).  Any ideas before I take it back in again?              
The car has 43K miles, so still under the emissions warranty.                  

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