It took me a long time to identify the igniter as the problem as the misfires with the engine running on 4-5 cil were momentarily at first.
After stopping some time when this happend, the problem disappeared at first, engine running OK, but the problem became worse every time and in the end the engine was permanently running on 4-5 cil.
As I have all the manuals, I checked all ignition parts for the values given in the manual and all of them measured good. The only part that had NO checking method was the igniter, so in the end I changed it with a 2nd hand from a '91 and voilá the problem was gone.
Mind you, measuring doesn't always show a defect as about 1 year after having the igniter problem, the car again had misfire code on cilinder 3.
I again checked everything and all was according to measuring values, so I again expected the 2nd hand replacement igniter to have failed.
As the error code this time was only giving misfire on cil 3, I moved the coil to another cilinder and the problem moved with it, so I knew for sure the coil was the problem, I replaced it with a new one and problem solved.
Strange thing was however that the defective coil looked absolutely new, no rust at all and it was within measuring specifications according to the manual, it however was defective, really weird!
