My 90 has recently started to loose power when under load. It only seems to be noticeable when towing and under load ie going up a long steep hill. This weekend I noticed that almost every time it happens, the temperature gauge jumps around erratically. Sometimes it goes off the scale to over temp, other times to cold?? I have checked the Red plug a couple of months ago and there was very small amount of oil so I cleaned it out. Also recently it's creating a lot of black smoke when labouring. I had it remapped a few months ago but im almost sure it wasn't like this when I got it back??
Any thoughts apreciated
Any thoughts apreciated