Hi Darcy,

For this sort of thing, I have a piece of kit to attach to the coil pack and then you can see if it is an HT fault by watching the spark. A scope does the same but if you have neither, then attach a plug lead between coil and plug and then get your timing gun out (remember them!) and attach to the lead and watch the flashing which will show up an ignition misfire. If nothing is there,then I would shift my attention to the engine. 4 gas readings would throw some light on it as well. Best of luck.

Regards

Pete M

PS. Although the smoke pro is supposed to be good, I have been led to believe it is not infallible. A 4 gas check would therefore be helpful.