4.0l v8 gems8 ignition, wont rev up!?!?!?

Hi there everyone,
I've got a 99 P38 Range Rover with a 4.0l v8 on gems8 ignition. I have recently rebuilt the engine due to suspect loose liners however when refitted and come to getting back on the road I cant get it to run.

The engine will start and idle (rather lumpy when cold then a bit smoother when warm) but wont rev up, it just coughs splutters and fires through the exhausts. I have replaced the MAFF with no results. I disconnected the crank sensor and it wouldn't start so I presume thats ok. Next I thought throttle position sensor however when using a cheap obd tool it was registering so I presumed that to be ok. I thought maybe the cam sensor, but apparantly they would run without it anyway. I'm pretty confident my rebuild is sound as all clearances etc. were checked and all ok as well as the timing chain being pretty difficult to get wrong.

Is there anyone who could offer any much appreciated help or advice?

Cheers, Craig

in your other post i think i suggested checking the crank sensor air gap and condition of the ring which it on the fly wheel with the teeth or tangs???

or did i dream it?

Cheers for that mate, got a crank sensor on its way. All the pins look ok, do you happen to know what gap they should be?

nope, but they should all be square, are there any scrape marks on the ring or on the crank sensor?

craig when you say changed mass did that include senser? it sounds like you are taking air in. too main places for this i have found are manifold and air pipe that mass is on. apart from this i would go for tessbook or sim or you could find yourself going round and round and we all know what that is like good luck j

Thanks for the help guys. Managed to find the problem. Due to using a 4.6 block for my rebuild, the welded in plate that hold's the crank sensor is different. So when I bolted in my 4.0l sensor it was too short (still getting enough of a signal to idle though) and the 4.6l had the wrong plug and tested differently so might have not been compatible with gems8. Managed to solve this problem by using a manual sensor (which is a lot longer,tests the same and has the same connector) and spacing it off 6mm.
Thanks again!

Good Man for posting the fix:clap2: