my renault van surges how can i fix?
 
                when excelerating my van surges,not all the time just now and then, no fault shows on diagnostic check, is it possible
 that the erg valve on the exhaust system is sticking and relaying incorrect messages to the ecu unit, my van is
 a renault master 2.2 dci turbo year 2002 with 115,000 miles
 on the clock
            
             James Heath
            
 August 2007