GM DTCs reliability

[martin at mgass.demon.co.uk]

One of our vehicles (1996 2litre 16v GM Omega) is showing the 
occasional check engine light accompanied by rough 'get home' running, symptoms as follows :

1. Put ECU into diagnostic mode and it emits trouble code 10-3-3-5, which I think 
is Crank-angle sensor.

2. Engine occasionally stalls on tick-over, only happens when engine is re-started whilst warm 
after a run (doesnt' happen from cold).

3. Most tuners take view that this SIMTEC ECU engine has two main 
fault areas a) idle sensor clogging up, b) crank angle sensor 
failures.  Idle sensor has been cleaned and also plugs checked and 
gapped.

I understand that Crank Angle sensor usually plays up as a result of 
heat or vibration (but I can't detect any changes in this area).

The question is whether to replace the Crank Angle Sensor (not cheap) 
or to look elsewhere for the root cause of the fault.

Anybody any comments/views ?

Thanks

Martin  
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martin at mgass.demon.co.uk
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