How I diagnose;
1) Swap plug cables and spark plugs to ensure they are good. Seems good for me.
2) Swap fuel injector, seems good as well. But when I swap fuel line from fuel distributor, ha I found that one of the output line from the fuel distributor does not injecting out fuel (very weak flow).
Then I know that the fuel distributor might have been gunked up, decided to clean it up. I disassembled the air flow and fuel distributor unit from the car. Took it out and decided to clean up by soaking it with petrol overnight. The next day, I blast the unit with pressurized air to clean up especially through fuel holes on the fuel distributor.
Please be reminded that before you detach any fuel lines from the fuel distributor, it is best to work on it once the engine had been cooled off. With this condition, the fuel pressure have decreased. Highly pressurized fuel line may spray off petrol out of it quickly, very flammable especially on hot engines. Prepare a rag, put it around the fuel lines, unbolt (12mm) slowly and allow it to release some pressure before completely remove it. Be reminded to replace all copper washers as well, prevent future leaking.
Refer to below diagram, I just detached the ones with yellow circle. It would be best to replace the gasket as well, however I did not do it since I don't have the gasket! I dont disassemble the fuel distributor, afraid the plunger might fall off or get damaged.
The result was tremendous, smooth accelerator response after that. I am too careful to just soak and blast off with air, no adjustments done. Please be careful not to accidentally adjust CO mixture ratio adjustment knob and the air flow plate. However still, idling and some erractic/surging happens. Unsolved since day 1.
* LEARN FROM MY MISTAKE. I soaked the fuel line to injector as well, it have made the line protection rubber brittle! Please don't do that ok..
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