Clean IACV
Clean FITV
Clean TB
speed sensor
fuel filter
check fuel pressure
check engine line not on
no vaccum leaks

when the car gets under half tank the car acts like there no gas in there, If I hit on the brakes coming to a stop rpms drop to zero car cuts off but it cranks right back up with no problem could the iacv start acting up when the gas level gets a certain point..im buring so much money keeping the car above a half tank and going to the mechanic....

 

Bad Oxygen Sensor with no code set in computer? It happened to me. Is your car doing any bogging down while in motion?

 

yea it does and its burning alot of gas

 

Check O2.

Also check the MAP sensor.

 

I had a similar problem, but mine ended up being a fuel pump. Hopefully its not that, but its a relatively easy repair to do yourself if it is

 

I took it to a mechanic and he said the fuel pressure was fine so I assuming I dont need a fuel pump. Only thing thats getting everybody I take it to is that it acts up under a half tank of gas or if I slam on brakes super hard...

 

Most likely the o2 sensor. The extra gas usage comes from the sensor sending bad info to the computer, which instructs the IACV to open and close at the wrong times, which creates a rich or lean mixture. I had the rpm drop like yours, too, but my car never cut off. That's because I would press the clutch and then feather the gas pedal to keep it barely running. Even with your tank full the thing can act up. I filled up and then went for an interstate drive. At first I thought things were great, but sure enough after about 7 miles I noticed the engine knocking and the rpm's dropping like a rock. It was the rich/lean
bogdown happening at 70 miles an hour. I nursed it back home and a few days later figured out what was wrong.

 

MAYBE MAP SENCOR THAT HAPPEND TO ME TOO

 

the mechanic said the 02 sensor looks like the one that came on the car and the map sensor didnt read any codes....so Im going with the O2 sensor..he said that sensor can through the IACV and the FITV off ...you was right brake drum

 

I was looking at O2 sensor today its looks real easy to put on...

 

So what ended up being the problem ?

 

It's doable. Mine was underneath and I didn't feel like fooling with jacks stands or crawling up under there messing with the hot exhaust, so a found a little nondescript muffler shop and they installed the Denso one I purchased and charged me 10 bucks labor. If you try it, make sure to remove the old one while it is still good and hot. Too hot to touch is what I mean.

 

the mechanic just told me O2 sensor looks beat up, clean the TB and IACV which was dirty, its strange how under half a tank it acts up or when I hit the brakes super hard, I'm going to try the O2 sensor, is rockauto.com any good I seen a sensor up there for cheap

 

Rock Auto good and good prices. Denso o2 Sensor is the right choice.

 

I went to advance got the part number anf found it under rock auto