B18C1 swap with unchipped P72 ECU.

I lowered my fuel pressure to try to get it to quit running rich and now (even after I've raised the pressure back up) when it's cold it idles way down to like 600RPMs and then back up to like 1800RPMs and back and forth - sometimes it even dies.

Even when it's at running temp. it still pulses in the idle from 7/800RPMs to 1200 RPMs.

Even stranger, sometimes after I've been driving the car for about 15-20 minutes it all of a sudden starts running super lean - so lean that it doesn't even show up on my air/fuel meter. When I'm cruising the power fades..... and catches back up.... and fades.... you get the idea.

If I turn the car off and back on, it's fixed. HELLLLPPP!!!!

I've thought vacuum, but I've checked them all... only thing I can think of could be a sensor.

Thanks!