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If you can hear the fuel running threw the injector rail. The regulator is bad. To test it, clamp off the return line. Or use a fuel pressure tester. Your going to have to replace the fouled plugs. Are you getting spark to the plugs?
You would check for spark at the plugs and the fuel pressure at the injectors. There should be a port on the fuel rail where you connect a fuel pressure gauge. You can also try spraying carb cleaner into the intake to substitute the injector fuel supply.
Test your compression on all 4 cylinders. Test fuel pressure at the rail. Check your spark plugs and leads while doing the compression test. It's unlikely to be bad spark plugs, but it's possible, that when you increase the load, the spark plug high-tension leads are finding a shorter path to ground. Just a few ideas on where to start.
3 things make an engine start : compression wich is lost slowly and seems not the case here , fuel : take off the air filter and tube leading to the intake manifold , insert 2 table spoons of fuel and with nobody face near it start the engine , if it start and died , the problem his fuel pump , fuel pump fuse , injectors or the computer circuit and finaly spark , test the sparkplugs and coils .
hi unlikley to computer on the fuel rail there is a pressure relief control valve some are operated by vacuum so check the hoses some are electrical this controls fuel to all injectors it may be open all the time and fuel going straight to the return to the tank if this is the case there is no pressure for the injectors to work the individual injectors you can buy a tool that fits on the injector and connecting loom thats not dear so it lights flash as the pluses open the injectors or get a multi meter the wires that fit on the injector one is ground usually [black or brown] and the other is a 5v live when cranked yates210456