I seem to have an issue with a sticky throttle on my MPI. It only really sticks when the throttle is visibly closed and manifests itself by giving TPS readings that indicate the throttle is not closed to the ECU. i.e. Throttle position is read as 5+ and the throttle switch is shown as "ON" on my ACR 4. This causes it to struggle to start cleanly without me blipping the accelerator to open the throttle.
If I give the springs on the throttle body a spray of WD40 and move the throttle through it's motion a few times then I can get it to return so that a value of ~4 is typically read on the ACR4 but this only lasts a few days. It seems that potentially being a bit colder makes it worse.
I've verified that the accelerator cable sticking isn't causing it as I've loosened it off and the problem still exists. There is an adjuster screw, can I just tweak this to increase the 'stop' position? What should a typical 'minimum' i.e. throttle closed TPS reading from the ACR4 be? I've only ever seen mine go down to ~4.