I have a pretty stout 2002 Mustang GT. A few months ago while sitting in heavy interstate traffic, a lot of stop and go because of an overturned truck in the road, it started running really bad. It wouldn't hardly idle and it would spit and sputter and if you really gassed it then it would run great for a few moments only to start back running poorly again. I dealt with this for a day or two and then decided to try and reload the tune in to the PCM and it seemed to do the trick and the car ran better for the last two months. Then yesterday I let it sit and idling and it started doing it again. The Air Fuel ratio gauge will show that it is running really lean and if you blip the throttle a few times it will usually straighten out. It almost acts like a carbureted car that is running too rich. I redid all the grounds the last time this happened and checked all my connections and replaced both front O2 sensors. It has stock Motorcraft plugs, Accel coils, TFS heads, TFS cams, Bullitt Intake, Twin 65mm TB, BBK MAF sensor, a new TPS when I changed the Throttle body, and a JLT cold air (under hood type). The air filter is clean, the PCM has no codes, and the car itself has 230K miles on the body. I don't know what type of fuel pump is in the car or if it is stock or a cheap OEM replacement because I bought the car with 145K miles on it and it was bone stock and even the air box silencer and a paper filter in the air box. The fuel filter is also fairly new and is a Motorcraft filter. It seems like it has a vacuum leak but the last time this happened it checked the manifold for leaks with some carb cleaner and nothing appeared to be wrong. The EGR is also deleted and turned off in the PCM along with the rear O2 sensors.
My guess is either the fuel pump screen in the tank is getting clogged up or the pump is going to go out eventually or maybe my PCM is dying.
If I buy a new pump which pump should I buy since I am at 353 RWHP and 344 RWTQ. For all the stuff I have heard about the stock ones mine hasn't held me back as far as I know and my tuner said it was enough pump when he last dyno tuned the car last fall.
I have seen the BBK pumps but I am unsure if I need that much pump and whether or not I will need to have it tuned again if I go with a higher flow rate pump.
Lastly the car runs great going down the road and it will just start running like crap when you let it idle. It doesn't even happen every time I let it idle it has just happened enough that I thought I would throw it out here to see what replies I get.
My guess is either the fuel pump screen in the tank is getting clogged up or the pump is going to go out eventually or maybe my PCM is dying.
If I buy a new pump which pump should I buy since I am at 353 RWHP and 344 RWTQ. For all the stuff I have heard about the stock ones mine hasn't held me back as far as I know and my tuner said it was enough pump when he last dyno tuned the car last fall.
I have seen the BBK pumps but I am unsure if I need that much pump and whether or not I will need to have it tuned again if I go with a higher flow rate pump.
Lastly the car runs great going down the road and it will just start running like crap when you let it idle. It doesn't even happen every time I let it idle it has just happened enough that I thought I would throw it out here to see what replies I get.
