ScarabEpic22

What is this IAC sensor? I cleaned the MAF sensor about a month ago and it didnt help. I looked at cleaning the Throttle Positioning sensor, but Im thinking I am going to probably need to invest in a repair manual. Any suggestions on which one to get and where? Thanks, Erik 99 RX 300 AWD

Thanks for the info, I will get a new filter and drop the pan and see if I can just clean the filter/screen with brake cleaner and go from there. I am pretty sure this wont help a lot, but when I changed the fluid on my TrailBlazer in July, I started to see a slight mileage increase of about .5-1mpg. I mainly just want to change all the fluids to make sure none of them are causing the problem.

I know the fuel filter is in the tank with the pump, and I can get the part for about ~$30, but I need to know how to drop the tank and install it. Can anyone give me a brief how-to on how to do this? Thanks, Erik 99 RX300 AWD P.S. Anyone have any mileage booster tips? My RX is getting crappy mileage, so thats why I am going to change the fuel filter and the ATF, but what else could be causing this crappy mileage of 16 on the hwy? It has about 55k on the odo. I am going to change out the rear diff fluid this weekend along with the fuel filter hopefully. The air filter is clean and the oil I changed 200mi ago.

My 99 RX300 AWD is having problems. It is getting 16mpg on the hwy, and thats with new oil in it. Amsoil 5W-30 synthetic. I think it is time for a transmission flush and filter change at 55k, so I have the Amsoil ATF, but which filter do I use? There are a few different ones that I have seen around, but how do I know what kind of tranny and pan I have? No parts stores around me have the RX filter, and Im not to inclined to go to the dealer, but will if I have to. I know how to change the fluid and filter as I just did it on my 02 Chevy TrailBlazer, but are there any tricks or tips anyone has for me? Thanks, Erik 99 RX300 AWD