I was having running problems and was only firing on three cylinder so i though i would replace the plugs and see if it sorted the problem.. I tried to get a replacement set of Champion "Racing plugs" that were currently fitted but had no joy at any local motor factors so ended up with a standard set of NGK's for £10

Im running stage three with 18 PSI at the moment am i looking for trouble running the standard recommend plugs or should i upgrade to something better ASAP?

The car has a slight misfire now as i accelerate with the poo plugs fitted..