AE82 Int. Crank, No fire and stall at idle

[Snich]

Hi guys I have a Ae82, with a 4AGE, and intermittently has crank, no fire. then some times it will start normally, but then ilde really low and then stall... I've also had it driving and then have a sugre once, and had it cut power down to ilde when accelerating ( then i backed off, then it accel. for a sec, then i got back on the gas, and had nothing, just ilde) then rolled for a few seconds, then it drove fine...
My problem is that it changes from symtoms from time to time, and it will only do it once every 3 or 4 days.. then more common one is crank no fire....
I tried checking for codes and it gave me code 456, I have no idea what that code is, my book does not tell me that one..
I changed the Dizzy bout 5 months ago, although it was a second hand one, and I've been told that the TPS on 4AGE's shit themselves a fair bit..... and my brother thinks its a fuel pump thing....

any help would be great, possibly ways to check the TPS, or should i just start changing those parts slowly and see if one of them fixes them.....
I hate intermittent problems, my problem doesnt even last long enough to really do tests...if it does crank no fire, if i turn the ign off for a few seconds, it will start first go..

[Snich]

forgot to mention that the base Idle is set to factory specs...

[legend]

have u replaced the ignitor or coil

[damo101]

code 4: water thermo signal is open or short circuited
code 5:doesn't exist
code 6:G or Ne signal was not received when the engine was cranked for 2 seconds or longer.Ne signal was not received for 50msec at engine speed over 1000rpm.

http://mitchee.com/imagestore/4age-d...ual-parrot.pdf

heres a link for the diagnosis book.

[allencr]

What's the compression?
What's the condition of ALL the wiring, especially the battery cables & grounds?
Whats the condition of the ignition system? Pulled a plug wire and seen a nice fat blue 7/16in.11mm spark?
Is this a transplant or been in salt water?

[Snich]

replaced coil pack, bout 6 months ago with new,
compression is at 190 psi across the board, wirings not too bad, car hasnt been rewired if thats anything to go on.
Damo, ure a champ. i've looking for that manual for ages...

[turbo4agte]

Your starting system is totally seperate from the engine.

Diagnose the starting system first. You might be looking at a main relay or ground, or something like that thats affect all 3 of the systems. But you can't do anything for sure until you check into it.

Never just throw parts at your car. Its an easy way to waste alot of money.

[myne]

mine does the same when a certain capacitor is loose.
Near the fuse box there's a little bass coloured capacitor that earths to the body through a bolt. I've had it completely stop my car once because the bolt came loose after I fiddled with it.
It might be near the dizzy on the std models though (mine's a gze)