if it causes problems at idle it is pretty simple to diagnose. Just unplug injectors one at a time. If it is not the cylinder failing, the engine will run worse, or simply stall out. If you find the cylinder affected, when you unplug that injector, it will not change how the car is running. Give it a shot and see what you can find. Also, might want to contact longassname if you do want to go with a rebuild, he is using 2.2l bearings in his engine build and they may end up being cheaper
Tom
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