Thanks for your reply .Thereis no noise ,yes there is a loss of power.As for the air filter I check it but I dont know what I'm checking for , if I can see to much grime I change it.My car has 94,547 miles,the car is an automatic.Now as for the fuel injector cleaner I had been putting it in when ever I thought about it ,but I couldnt tell you how often. As for the oil change well,I try to do it as instructed by the manuel but sometimes I may be a little late by about 1000 or so miles,BUT I do change it reg.the last time I went to the local Theres one more thing I forgot to mention yesterday as I was driving home the car just shut off .The radio stayed on and the steering wheel did not lock ,It started right back up. So can you HELP?