So as most of you know i just got back into a fox again and i have been having some promblems out of it, so here we go,when i first start it it idle's around 1200-1400 rpm,s but still runs good and has all of its power but it seems like when i let it set and idle for a while it goes to normal idle 700-900 rpms but it surges in low rpms and has no power what so ever,it evens get less responive and has a tendency to stall, i've done cleaned the iac,set the timing,and tps with no luck please somebody help me figure this out and it is a aod car too

 

Have you checked really good for a vaccum leak?If not get some carb cleaner and check every hose and gasket in the intake system.

 

i,ve runned over some vacum lines that looked a little dry rotted and still nothing but the funny thing is that it is most noticible when the car is warmed up

 

When I did the intake gasket on my car it kinda acted like that and found my lower manifold gasket leaking under the throttle body.When I disconnected a vaccum line the idle went up pretty high plugged it back in and just about died.Ran pretty good till it got warmed up.The only other thing I could think of is maybe the coolant temp sensor for the computer.

 

Yeah like he said, check the intake gaskets, I had the same problem.

 

check for a vaccum leak first but i had the same problem and it was my EGR it was reading open so i plugged up the hole

 

what mods do you have you may have to many for speed density

you could always convert to mass air