Hello,
my Polo starts in the morning, and after seconds it dies. Rpm drops to 600-650 and it stops. Usually it makes this, when the humidity is high, and the car stopped for hours. When I start it again, everything is perfect.
I replaced the fuel pump, fuel filter, coolant sensor, spark plugs, wires, distributor, and cleaned the throttle valve, but nothing happend.
Can anybody help me? And sorry for my bad english, this isn't my mother language

 

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You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.