just a further note that may help. my 87 5kcstq with tap chip and 1.8 bar spring totally blows away my sons s6.....so much so that i can pass him flat out in third gear? do any of you know if this is normal or is his car exhibiting some other symptom that could cause the plug problem? (very few cars can challenge my 5k) :>) mike 87 5kcstq 93 90 q