Help!

[zoomered]

Ive been having a bad running problem, Car missfires under load. It will run fine for weeks then do this and once you clear the codes will run fine for weeks again, then fault again... Im thinking its the ecu going into limp mode cause it will run fine after clearing the codes. Read the codes today and im getting

00625 Vehicle speed signal, signal outside tolerances

00533 Idle air control regulation, lower stop valve

00530 Throttle Valve position sensor G88, Deviation from desired valve intermittent.

Car is a 8v ADY 95

Anybody shed any light?? Thanks

[VAGMAN54]

does the car stall at junctions ? does it idle ok and start from cold ok ?

[zoomered]

When its running fine its running fine. When its running in what i think it limp mode before i clear the codes it doesn't want to idle when cold and stalls at junctions for the first mile. Its had a new crank sensor, ecu temp sensor, plugs, leads, dizzy cap and arm and a service.. HELP!

[VAGMAN54]

i would suggest removing and cleaning the throttle body then refit it and reset the basic settings if my memory serves me right that system is a simos i think and there can be other issues but i would do that first

[zoomered]

Sorry forgot to mention ive done that too.

[VAGMAN54]

am i correct that is a simos ecu ?