well i thought it was sorted put a new ign amp on and it sorted it for a day now its missing again same as before.
i also put new plugs in to rule them out can only be coil packs but i thought they are tough as hell on a agu
There really isn't enough information to make a conclusion, though the ignition amp is a prime suspect. So rather than pointlessly swapping parts, some investigation should be done first.
There is other useful information, is it smoking if so what colour and under what conditions?
You need to know if your misfire is a fueling, compression or ignition problem.
1. Locate the misfiring cylinder (if it is indeed just one).
2. Check the state of the plugs and the gaps (of all cylinders).
3. Perform a compression test on all cylinders. All cylinders should be around 11-13 bar and each within 0.5bar of each other.
4. With a long screwdriver, put the pointy end on the injector and the other to your ear. Check each injector is firing (to be honest if it's an AGU you'll hear the injectors ticking away without it, it's deafening under then bonnet).
All are cheap and quick to do, should take no more than an hour in good light. Also when following problems, always trace backwards from the issue.
As the most likely suspect is the ignition control module. You are best working back form there.
If it's just 1 cylinder, and the plug is good, swap over the coil. If the misfire jumps it's a dead coil. If it stays the same, the ignition amp is the next suspect.
With this further information, I will be willing to bet it's not a misfire, but rough running due to fuelling. Also please note that it may not be your MAF even if swapping it gives a better result.
All unplugging/swapping the MAF shows is that something is f**king up the fuel trims. Replacement of a component seems to confuse the ECU for a bit, making it give defualt values. Then when it readapts the problem returns.
