Ok, well here goes describing this as well as i can!
The car runs well while driving to work and around (laps of town you know how it is lol) but every time I have done a long run in it - lets say 80 miles or more I get a strange problem.
What happens is the car will start to loose power, like a misfire but not juddery (made that word up) and if I slowly put my foot down the power stays the same till I get to full throttle and suddenly there will be the normal amount of power that full throttle gives. This is coupled with a nice dash of black smoke out the exhaust. So surely the fuel is getting there as its that not burning thats giving the black smoke. Air? Well that has to be getting there cause the charger, while putting the foot down the induction noise gets louder yet no acceleration till im flat!
So is it ignition? a dodgy chip? (has a 65mm pulley and jabba chip) and why does it only happen after a long run? Once it did stay there after 120 and I drove it to work the next day!
I am so confused and would be very grateful for any suggestions - sorry if I described it shite but its the best I could do lol!
Thanks!