For the last couple of months I've been getting an engine light problem (been coming on and off randomly) and found out it was the knock sensor. So I replaced it with one off a 20v I had lying around. All works good except it runs quite rich and I've had to adjust the idler screw to stop it stalling (or shuddering) after I've given it a bit of revs.

Would anyone have a solution to this? I never had this problem until I replaced the sensor.

Any help will greatly appreciated :-)

Use toyodiy to compare the sensors. If they are the same then you have other issues, it may well send the ecu into limp mode if the 20v one is different.

Indeed have you tried re-fitting the original sensor?

Would it be possible that another sensor shit itself coincidently. Maybe the o2 sensor? Or making it misbehave?

And I can't refit the original sensor, the plug on the sensor came off whilst removing. Which was probably why it was misbehaving in the first place.