Car not idleing properly, code 55???

[acarmody]

My VX Berlina won't idle properly, it will sound like it has a massive cam in it if you can imagine what I mean. If you touch the accelerator to take off it will massively dip in RPM with it coming very close to stall before it takes off. Also it did stall on me today when I went from drive to reverse, shes an auto. My initial thought the vacuum hose on the bottom of the TB, because this has happened before, nope all fine, and can't see any other obvious problems.

RACQ came out and he had 2 different OBDII tools and neither would talk to the car so we gave the old paper clip a whirl. It went something like this:
1 flash, 1.2 second break, 5 flashes, 1.2 second break, 5 flashes, 3 second break, 1 flash, 2 flashes, 1.2 second break, 5 flashes, 1.2 second break, 5 flashes, 3 second break, 1 flash, 1.2 second break, 2 flashes, 1.2 second break, 5 flashes, 1.2 second break, 5 flashes, 3 second break, 1 flash, 1.2 second break, 10 flashes, then kept repeating the code 10 (1 flash then 10 flashes).
If I'm reading this properly then I'm getting code 55 which is ECU faulty, bugger.

Anyone had similar problems or can recommend a fix, I will try and get it too a TechII at Holden using back roads, but I have to be very careful. The RACQ dude backed it up 10m and back forward and nearly stalled it twice. Am I maybe up for a secondhand ECU?

[acarmody]

I should probably add that on Friday night I installed a new Mitsubishi 120amp alternator, genuine from Holden. Installed no issues, yes I did disconnect the battery. But car only used to have the Bosch 100amp alternator, but I can't see that being a problem.

[Tree cutter]

I read that as (155 right oxygen sensor heater circuit malfunction) 355 ignition control circuit coil 5 then 1255 dont know what that is and 110 dont know either.
I would put my money on a crook coil causing your engine to run rough. the oxy sensor will only make it burn more fuel than normal.

[acarmody]

Ok I took it to a auto sparky and he used their scanner to pull the codes and there where 4 of them. MAF, purge solenoid(?), torque converter something and something else that I can't remember. They couldn't work it out so they recommended a guy around the corner with a dyno and he can run it and map it all out, just can't do it till Monday. Anyway I was doing a service this afternoon on the car, oil, filter, plugs, but I also checked the resistance on the leads and the coil packs, and yep all fine. So I decided to check the MAF plug, A is supposed to have 4-6v, it had 4.6v so all good, B is supposed to be ground and yep all good, and C is 12v constant from battery, it read zero. I'm like WTF so I look through the service manual at the electrical diagram and yep same fuse powers the MAF and purge solenoid (both are errors), pull the fuse and *sigh* its blown .

Anyway new fuse and she goes good again and engine light turns off, so go on a little trip for 20min and halfway through the engine light comes back on and she starts misfiring again *sigh twice*. So back to the sparky on Monday.