2000 Focus SE Stumbling & Stalling

[kcarlen]

Hi all,

I have owned a 2000 Ford Focus for about 10 years now.
2 days ago, my wife indicated that the car started stumbling while driving to work. She could barely keep it going, at low RPM's. (Automatic)

I have taken the car for a ride several times since, and have discovered that the problems seem to disappear after about 1/2 throttle and up. That is the car has power and works fine until you let off of the gas. Doesn't matter whether the car is warm or cold.

There are no CEL's, and I have an OBDII reader that can clear codes as well.

In reading some of the threads last night, I replaced the following tonight, in hopes of solving this problem.

1. Replaced Both O2 Sensors
2. Replaced Air Intake Filter
3. Replaced 4 Spark Plugs with Autolite Double Platinum plug
4. Replaced the bad Throttle Body/PCV Hose mentioned in threads on FocalJet
5. Tried the EGR bypass/DPFE thing mentioned on FocalJet (didn't make any difference)

I was praying that the problems would be gone when I started her, but sadly, I could tell right away that they were still there.
Stumbling and idling very poorly, almost stalling.
If you push the throttle down, you usually can clear it and rev it up, after a heavy bog.

I don't know what else to do.

Years ago the Fuel Pump was replaced, under warranty.
It has a full tank of fresh fuel put in it this morning.
I have not checked the fuel filter, is this a symptom of a bad filter?

Please, if anyone has any information that may be helpful, I would love to hear it.

[Davescort97]

You have just about every base covered. The only thing I can think of is a bad IAC or a vacuum leak off the intake or the PCV system. The IAC can be cleaned with carb cleaner and oiled with a drop or two on the shaft.

[djco2us]

i dont know but i got the same problem i've already changed the spark plugs,the wires,the Ignition Coil,the Fuel Injectors,the pvc and egr valve and the car heats up but i dont get a reading on my Temperature gauge and the fan doesn't cut on. i don't really what else i can do the mechanics keep telling me they don't know whats wrong with it but if i try going full throttle i get a very heavy bog the car feels almost like im slaming on the brakes the the car revs super high to the point that i have to get off the throttle beacuse i feel like i'm going to blow the engine