Hey guys,
My 2003 Polo 1.4 16v has been experiencing Misfiring, Rough Idle, and Power Loss intermittently. (30% of the time)
When this starts happening the car is basically undriveable. Can't get up to speed and stalling.
Turning the car off and letting it sit for 5 minutes seems to cure it, before it happens again.
The aircon also plays a role in this as it seems turning it on will make the problem more likely to occur.
(Extra load on the engine?)
The problem is its intermittent so it's very hard to trace. I have found no way to reproduce this every time.
I ran a OBD Scan and found no codes apart from the faulty v68 motor for the air re circulation.
(Which shouldn't cause this).
I've googled and asked a few people and come to the conclusion that it is the coil packs, I tested them with a multi-meter and got 380 Ohms for all of them, which, according to this link
Best way to fully test the coil packs?! - Skoda Fabia Mk I - BRISKODA
is the correct amount of resistance.
There does seem to be some sort of after market wiring though.
This is coming off the connector of the first coil pack.
I believe this a ground wire being spliced into 4? I have no idea why this is done or if it is stock.
I haven't ruled out the possibility of the coil packs but they seem to be working fine. I've changed all spark plugs and inspected everything. I have also been told it could be a fuel problem, which I think is unlikely.
I'm a student so I'm desperately trying to figure out this problem without spending money that I don't need to.
I have also read that these engines suffer from broken exhaust valves but I do not believe that is the cause because it would not be intermittent.

Any help is appreciated.
Thanks guys
-Harry