Ford Sierra Cosworth ECU Prom

[Clint Sharp]

A friend has just acquired a 1989 Ford Sierra Sapphire Cosworth
and is experiencing some problems with the turbo. If the car is 
driven on boost then all is fine until it comes off boost. When
he accelerates again the turbo doesn't produce any boost (at least 
it doesn't feel like it, no spine snapping acceleration) and acts
like a fast 2l car. Any suggestions? (I've been elected to fix it
as he thinks it's an electrical fault) The ECU has been modified
and he hasn't got the original chip. Does anyone have a copy of 
the standard chip they can mail me? Any suggestions as to the 
cause of the problem would be gladly accepted.
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                       clint at clintsmc.demon.co.uk