071 spark plugs
I recently replaced the denso pk20pr-p11 spark plugs in my 4 wheel drive cossie with the recomended o71s(car is stage 1 with a t34) only because the densos had been in for about 2 years; the car then became very lumpy off boost but felt very stong on boost. ive ordered some new densos today but i have been advised that if the car runs like this off boost it means its running lean but other people have just put it down to the 071s being a crap plug anyone any ideas?