Thanks for the reply Jon. All inputs appreciated. The issue is all sorted now but after several dead ends I took it to RPi Engineering. The underlying fault was a bad TPS and the idle speed was likely varied due to several incorrect EFI settings. The ignition timing was rather retarded from...

That's a good idea, hadn't thought of that. I'll give that a try. As others have said there is no road speed sensor that quashes another theory of something I'd seen on the net about the old Range Rover "For safety reasons, Range Rovers have a "kill-joy" function built into the ECU program. If...

Ok, thanks for that, a few bits to check there. Engine temp has no bearing on it, cold or hot it's the same. Just took it out. Another observation.....if you're in D at say 2300rpm and move gear selector to 3, the revs increase as it selects a lower gear. This has the same cutting out effect...

Thanks for the suggestions. Coil is fairly recent and fittings looks new and clean but I will have a look as not double checked there. The valve had a new gasket and was working as it should when tested. With regards to re setting the new adaptive values for the IACV, not sure how to do that but...

No bogging down, everything is normal to around 3000 then throttle goes dead. Engine doesn't stop, it continues to run. After about 3 seconds when the revs have dropped off a bit, push the pedal and the power comes back in.

Recently fitted a new idle air control valve which has sorted out my fast idle. Quick road test and she now dies as soon as she hits 3k rpm. A couple of seconds off the pedal and she's ok again. Sitting still in park I can freely rev it to 4 or 5k with no issues. Is this a mass air flow sensor...

Just joined the site so not a good start to hijack another thread but thought some of you experts may know the answer. The input lead that plugs into the IAC Valve (on a 3.9 V8 from a 93 Disco). Should all 4 pins be live all the time? Put a light tester on them today, 2 give a response but 2...