the blue plug is for the mixture solenoid and the white one is a throttle position sensor.you're not gonna get those to work without a computer.that is a computer controlled carb. might work without the electronics hooked up.make sure you stretch the spring for the power enrichment.clean the rods.check for worn throttle shafts also.Very common on an older unit.check the bottom of the float bowl.there is a plug down there.make sure it's still sealed.or it will always run rich/hard start as it will slowly drip gas into the intake.