There there friends.. i recently swaped my stock ld9 to the HO intake manifold..
after that done.. i have been having a problem. the car goes lean when it goes under boost.

I changed the sparks thinking of that and closed even the gap to .25 and ran fine for a moment then it went lean again..

The car runs fine under vaccum ... the problem is when it goes under boost .

My a/f is set between 10 and 11 reach as fack.. but now it jumps to 17 when the boost comes in.

Help please i dont know that else to do other than remove the many and put the oem back on...

Thanks

I took the sparks out and found this two like this.. what does it mean ?

You have nothing about a boosted setup in your garage so I have no idea what setup you are using or coming from. Are you turbo and changed intake manifold style or s/c and changed to a tuned header? If you improve the airflow through the motor it will run lean unless you retune, you have allowed the motor to breath without telling it to add more fuel. Changing your spark gap doesn't change your air to fuel ratio.