If oil got inside the ECU it could have made damage which you can't repair only swappig the ECU with known good one can rule it out... on such old vehicle the only 100% certain way to fix an intermittent wiring issues is to replace the whole engine harness with a new one or at least rewire the MAP/IAT circuit from plug to ECU if you are skilled enough to do that
thanks, I will report back when I have looked at the ECU, harness plug etc. I assume the ECU has to be coded onto the vehicle if it gets changed.
 
though mine is old and does not have the latest software so it may not
it definitely has it, i have an old one too...the soft was updated only for air suspension and ACE for the engine has everything from the beginning... if you go to programming - there is the "learn security code" and injector coding somewhere
 

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