A4 1.9 tdi 1997 key and heaters problems

hi i just bought a 97 a4 1.9 tdi when you start it it runs for two seconds then cuts out maybe 4 or 5 times i tried a different key its the same. is there an imobilizer in the ignition barrell pls any one know if so can i
change it.
and i think the heater motor is not good heaters work in a morning then thats it for the rest of the day i need to change them are they easy to get to with the car having air bags. any replies would help mike mike707 snipped-for-privacy@yahoo.co.uk
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