Thanks everyone. I pushed it hard today and check engine light came on. So Advanced said the scanner showed clean EGR valve or replace. car ran better after light came on,night and day difference. Computer changed the tables to even it out.
You shouldn't put platinum in a car that doesn't call for it and like wise.
Yep, I hate trouble shooting as well and sucks on a 3.4L as half the plugs are behind the motor
. Work,kids equal no time.. Hahaa