Had the p1 on the rollers today and as you know they run the car in forth but for all four runs it had a small missfire.
The graph shows that the curve climbs as normal then a drop then back up until it starts to drop off.

Is it a spark plug not working correct or ??????

Richard..........

 

Could be coil packs, these do not like high loads which an RR session will induce.

 

My 99 car had a slight misfire in fourth gear so i checked the plugs and the gap was over 1mm, set them at 0.7 and all is well!

 

My car suffered the same symptoms as yours, turned out to be the MAF sensor.

 

It will be plugs, check and re-gap to 0.7mm, how many miles ?

 

Only 7000 on the clock and just had a service ??????

Cheers for that Bob

 

Plugs wouldn't be touched for 30,000 at least by a dealer but they do suffer at times so its always worth checking, if they are at 0.7 close to 0.65 and then test.

cheers