Try this. Use a meter with duty cycle. Check at x11 test pin 3 at idle.Engine temp 180. Idle duty cycle adj to 50% +- 5%. Run engine to 2000 rpm. Duty cycle 30 to 40%. If not. Take The EHA out. Take the plug out at bottom use a 2 mm alan key to adj turn L to lean R to rich.High no lean loe no rich. Put back.Re test again.You may need to do 2to3 time to get it right. On the left side of air flow sensor housing. This is the air flow meter with A plug have 3 wire. Pull out about 1/8". Use jump wire at centre wire. Use a volt meter. You need to have .65v to .85v. If not. Loose the screw 1/4 to 1/2 turn. Adj to .65 to .85v at idle engine temp at 180. Take car out for a test drive. Re test & re set to get it right. Hope this help you rough idle.