In the past you had a good chance of finding out what was wrong with your (gas) car. Now so much electronic stuff has been added it is difficult to trouble shoot them with out special analyzers or taking it to someone to trouble shoot.
While it is true that mechnical fuel injection systems are expensive when they need to be fixed; if the system is kept clean they are not troublesome and there are proceedures you can follow to find out what might be wrong.
In an envornment of heat and vibration electronic components do not hold up as well as mechanical ones. Not to mention it will take special testers to check out these type of systems. As an example of cost I just looked on Ebay one Ford Powerstroke diesel injector is $99-$139 each; an injector drive module $159-$249 and so on.
I would rather put up with my old fuel injection system then have one that I cannot trouble shoot without buying alot of expensive testers or afford to repair.

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84 300D, 82 Volvo 244Gl Diesel