Is there a chance that the old ECU was causing over fuelling & boost spikes?

THe stock fuel map is/was apparently on the rich side of ideal, for safety sake. How it varies with capacitor ageing, I don't know. Overboosting - I think that's a wastegate issue, probably an actuator issue, not the ECU. 
 Mine is running silly rich and I am expecting the fuel pressure to be high, due to the regulator being old. If it is, I will buy an adjustable reg. Also my stock actuator was leaking so I have bought a Kinugawa actuator with 11psi spring, and blocked off the TVSV system, until I see what's happening. Then off to the dyno for adjustment. 
Stock recapped ecu, stock injectors (I think), Hope that helps.
 

Thanks man. I was going to run this ECU for a week / 1000km if it doesnt stall - I might get a dual stage boost controller and make turn to the boost up on the other side to 10psi or something. THats the plan anyway haha

I'm not sure you should try "overriding" a problem with a boost controller. What might happen if/when the problem is solved, maybe boost to high heaven, which is a very big number, followed by smoke.
Sort the ECU first.  Thinking about it, you mention overboosting ....hmm that is another thing that needs to be explained /understood before increasing.

So its been close to a week and the car hasnt stalled again. Done over 300km so far.

Excellent, good to hear, sounds like you have fixed the problem. Thanks for providing all with findings!

how much for the old broken ecu?
im not joking i will buy it,pm me with details il get some money to you
cheers

twomr2`s
how much for the old broken ecu?
im not joking i will buy it,pm me with details il get some money to you
cheers

 hey mate im probably get the old one recapped for now. and keep it as a spare.

 
hey mate im probably get the old one recapped for now. and keep it as a spare.




 
no probs i recap them but im a hobbyist not a business,been looking for spares for my fleet