Glad to hear that part of the issue was fixed . To try and sort out the fuel issues I would start with replacing the fuel filter .
Make sure there is no air getting in to it (seal has to be perfect).
Air also can get in the fuel system if injector(s) are faulty and don't close properly .
Fuel filter issues still would allow the engine to rev up in neutral but maybe not under load .
Clean the MAF sensor and replace the air filter .
Check number 1 injector by measuring the coil reading (should be arround 120 ohm) . If there is no reading than that could be the problem . Engine management computer will not let engine to rev up over 2000 rpm if doesn't get the signal from the needle sensor inbuilt in to injector 1 . Also check the electrical connections on it - including connectors too).
Some say that sensor can be baypased connecting a 100 ohm resistor in parallel on the 2 wires . (not sure about it , mine is still ok ).
If all above ok than only thing left would be injection pump (hope not).
Can you rev it up over 2000 rpm in neutral ???
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