[3.9 Bad Idle]

It's an old one I know, but I'm at my wits end with it.

I've got a gulf spec, 3.9 V8 EFi 1999 Series 1 Auto (non Cat). I've had a 6 month long-running problem with the idle being erratic (pull up at lights to have the revs dip, and usually recovery, also, low speed driving sometimes a problem with low revs.

It's got the Lucas 14CUX hot-wire and now most of that is new.....

I have replaced:

Fuel pump

Fuel Filter

Leads - Magnecore

Rotor Arm, Dizzy Cap, - Genuine

TPS

IAC (Stepper)

MAF

Coolant Temp Sensor

I'm sick to death with the problem and just can't diagnose the problem properly here. I'm in Qatar and the local main dealer hasn't been able to fix the problem, they have reset everything and whilst it's certainly running smoothly, it just doesn't always idle right.

My last remaining items to try (in order) are:

Fuel Temp Sensor

Coil

VSS

Anyone else got any other ideas before I drive it into the sea?

Thanks

Ben