its kinda bitter sweet to see that this problem exists with the z a lot. i have recently replaced the injectors and with that cleaned everything i could. the problem was there before and is still there. after reading the other posts my problem is very minor. i will let it go until i have a full failure and in the process educate myself on the whole subject. the only thing i havent messed with is the coolant temp sensor so ill check that right away. thanks for the help.