I have a 2002 Dodge Durango 4.7. The other day it started stalling when breaking. Now to start it you have to hit the gas, it idles rough and low, and it will die when you hit the brakes and the brake pedal is very hard. So far i have changed the spark plugs, coils, fuel pump/filter, Crankshaft, camshaft, TPS and idle air intake valve. I also cleaned the throttle body. I am at a loss of what to do now. The guy at the auto part store told me the EGR but I don't think the 2002 has the EGR. Any help on what it could be is appreciated.

 

If the brakes are really hard, and you are stalling at stops/rough idle..... Try disconnecting the vacuum line to the brake booster, and plugging the port on the intake manifold. Your brake pedal will still be REALLY hard, keep that in mind.... but, I suspect the other issues will go away. (vacuum leak at the booster/line, or bad booster.)

 

Finally got around to trying this and it does the same thing. No change at all.

 

So the brakes didn't feel any different with the vacuum line to the booster disconnected?

 

The brakes were much much harder but all the other issues still remained.

I've also now changed out the MAP sensor and still is having the same issues.

 

Verify you have good fuel pressure. Yeah, the pump may be 'new', but these days, that don't mean squat.

Also, if your various sensors are not genuine mopar sensor, you may be introducing more problems than you are solving....

Do you have a scanner that can read live data? If so, get the engine up to operating temp, and see what the sensors are reporting. (and any codes it may be tossing as well)

I don't know if you have EGR or not.....