Hi, thanks for all the responses 1) Although Idle is erratic, the engine _seems_ to run evenly - could two of the wires still be swapped? I will be checking this anyay, but thought I'd ask. 2) As soon as the idle speed microswitch is released, the engine goes nuts and threatens to stall, so I don't think it's the switch. 3) Control pressure reg has been reconditioned by a reliable source. 4) Unlikely to be moisture as the car's been inside for over 9 months, and the whole enigne's been stripped :-) Richard #2727 twinenginedmc12 wrote: > Hi Richard. > > I'm familiar with the "It worked before I fixed it" phenomenon. <snip>