ecu controls the idle. Just need everything working properly and the throttle plate/tps/ dash pot adjusted to spec and it will idle perfect all the time.
If no coolant mixed with the oil then just fill it up and change it at normal interval.
If you really want to run it for 5 min then drain and fill and change at normal interval.
There is no break in procedure for a hg or any other gaskets. Engine break in is for seating the rings.
The engine and sensors are all the same.
The body harness plugs and Ecu plugs are different.
So you will need a chaser/soarer Ecu to go with the harness.
First I'd replace the crank pulley. After 20+ years the rubber part tends to come apart. It's some what common.
Also it's not the rubber that dampens. It's the weight. The stock pulley is balanced and is a counter weight. Using a cheap light weight pulley is going to give a knock.
Use a ati...
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