I am debugging a very rare issue of sligthly rough idle. (I say rare because in 6 months it showed up no more than five times) (and just by restarting the engine it goes away for other several weeks)
I have a new MAF, just changed spark plug wires, etc.
Car is great ! But this little flaw annoys me.
I am replacing the spark plugs. (cheap, still in their lifecycle but I prefer to be sure) (also, I am afraid they may be plats and/or resistors - not recommended for my 104 engine)
I am ordering them from the US (OE Bosch) along with a full steering link. (the last is expensive in Brazil)
I am planning on buying one ignition coil - just in case - or for spare.
This may be a crazy question, but ... is it valid to change just ONE faulty coil or they must be replaced in sets?
If I can go with just one would the Bosch 0019 (seems to be OEM) be Ok ?
By the many searches I did I deducted that if after the spark plugs are changed the issue is still alive chances are that I will spot one defective coil. They are cheap in the US and if I don't use it now it will be prudent to keep one as spare.
Thanks in advance, Jorge