I got a 1990 turbo 2, she hasnt had service for a while but she started misfiring so i have put some NGK plugs in BR9EQ but this has not sorted it out. I then went to check if both coils were creating a spark and they are both ok. Can anyone suggest something please or had a similar problem or could this be a serious engine problem? Thanks

 

What is the color of the spark. It are supouse to be blue and 3/8" from ground. If ok, maybe you have fuel ignition problems. Maybe a lean or rich condition. What are the color of the sparks plugs. They're supouse to be light brown to brown. Check for broken or damage spark plug cables, dirty grounds, bad ground connections, etc. Also check the compression to be sure that is no a broken apex seal, because the symtons is like a bad spark plug.

 

had the same problem with my TII. turned out my car doesn't like regular NGK plugs, so i put platinums in and the problem disappeared.............