I have a 2000 2.5
I changed the vacuum hose from the throttle body to the valve cover, replaced the AIC valve, then cleaned the throttle body and the MAF sensor. After all that it idles very smooth
, but if I rev the engine, after it drops to a lower rpm, it then idles rough for about approx 4 or 5 seconds, then goes back to smooth. I did all this while the tank was 1/4 full.
I just filled the tank, and I rev the engine, and after it drops RPMs its completely smooth - no rough idle. I did this multiple times - same result. I'm thinking the pressure of a full tank pushes the gas through better than a near empty tank - I guess.
So I think my issue revolves in some way around fuel. I went and bought a fuel filter which I will install this Saturday; this is where I'll start cause its cheap and likely needs changing anyways.
If changing the fuel filter does not resolve it, then do fuel pumps, when they are getting old, work better on a full tank?
Is there any other fuel line parts that should be replaced starting with cheapest or most likely first?
Do i sound like i have a clue and going in the right direction?
Thanks for any help.