I know this is a bit left field but if it twere mine I would make sure the cambelt is ok and check the engine is timed correctly ie it hasn't jumped a tooth. I know it runs on easy start but to put it simply it's not really a precision calibration. Sniff the exhaust to makes sure there is no fuel being administered - are the plugs wet for example. Use a noid lamp on the injector loom to tell you if the injectors are firing. There is more to look at here. Diagnostic codes - are there any errors showing? As said, connect a fuel pressure gauge to the schrader valve. Is the fuel clean - any water in it - have you run very low on fuel recently. Does the rev counter move on cranking - if not no signal from the crank sensor.
Sorry op but I think your garage has got the "it's an old car" syndrome.
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