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KLZE with ecu. I have recently been in idle and my car would rev to 3000 drop to 0 and do it all over again and again! Only does it in idle and only sometimes.

I was racing at the track and i shifted into third and drove for 1 second and it started almost bunny hopping ( no tire squeel) but it was like bogging out and s--- so i took it out of gear and then put it back in fourth and it was fine......

I spent so much fixing my engine and now this....

I'd say maybe check for some vaccum hose leaks and leaks in your intake system.

pin 10 and ground reset idle,
check idle screw on the throttle body.

did you time your engine? i had that problem and i timed my engine and it almost fixed it 100%. it now only does the drop every once and a while and it is like 200rpm drop.

Sometimes crazy idle can be due to a tps problem. It's a possibility but if it's doing it while you are driving, it's not likely.... Just an idea of something to check into. I think my tps is going, my car does some crazy sheet sometimes at idle. revving up to 2500 rpm and then dropping to a grand. Other times my car idles around850-900 and is fine. I'm not sure whether I should adjust my idle just yet because I have a feeling I'll be stalling occasionally when the car is idling properly... If the jumping around at idle sounds similar though, you might want to look into the tps being a problem.