Erratic tick-over

[LenChim]

4.5 chim. I have an erratic tick-over. When the engine is warm It slows down to almost nothing then revs up again, ut other times it runs at 1500 rpm. I sometimes smell petrol. How do I check that the stepper motor is working? Can I put a voltage onto one of the pins and see it move? The car sometimes seem to shunt if I am moving in slow traffic. Oh by the way the car seems to go very well apart from that.

[LenChim]

As you can see I have cleaned the stepper motor, although it was not ever dirty to start with. Now I will have to see if I can get a RG software and cable.

[LenChim]