I'd persevere, you could spend a billion hours tuning and fine tuning a megasquirt ECU and still not get it to run half as good as the stock stuff.
Ebay UK has plenty of 940 ECUs and EZKs on it. With the ebay shipping programme you should be able to get a couple to your door for a tiny fraction of $400.
Remember you'll need some high impedance injectors to match.
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