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If possible, it would be good to use all the electronics from the Jimny. Only use the 'long block' from the Wagon R+ and bolt on the intake, exhaust, everything from the Jimny. Having said all of that, This sounds like it could be as simple as a vacuum leak. If the engine is fast idling rough when cold and then as it heats up tries to idle down and start using it's sensors (coming out of an open loop pre-programmed mode) So, either there is a gross vacuum leak, or one of the inputs is so far off, the computer can not compensate. After checking for vacuum leaks, check the O2 sensor for function, then check the coolant temperature sensor (the one that goes to the computer, NOT the dash gauge)You may find something in those three checks that will help without needed to get into the diagnostic port.Good luck, tell us how it ends!-Eric
If it was made for Sweden, it's most likely OBD1 - Rhinoman's webpage might help you figure things out. He used to offer an interface and software for Windows, but I'm not certain if he still does.http://rhinopower.org/tech.html