Idle/ECU Problems

I have a Isuzu Rodeo (Frontera) 2002, the revs begin at 750-900 and the gradually increase to 2000 until I remove the fuse from the ECU/ECM then revs go back to normal.

I have had all the front end sensors replaced, the ECU/ECM checked by a professional and he indicated that the was no error codes appearing but he still thinks that the the unit is faulty...

Can anybody help me?

The idle control sensor in the throttle body is probably gummed up!

Thanks Ryan,

But I also had this replaced...could it be the ECU?