Well generally an EGR problem is only when the vehicle is already warm. And unfortunately i'm not familiar with your particular truck, but maybe this link might help a bit. http://autorepair.about.com/cs/troubleshooting/l/aa042603a_10.htm
And yeah, 5-10 minutes with the battery off should be good to make it relearn. Forgot to mention that you wanna let it idle for a few minutes afterwards to let it figure things out.
If it doesn't idle correctly ever, then i'd say it's most likely a vacuum leak, a fuel pressure problem like you said, or an ignition problem.
Fuel pressure can usually be checked at the fuel rail on newer cars, kinda looks like a tire stem. You might be able to borrow a pressure gauge from an auto store. But make sure you get a high PSI fuel one, and not one for a carbuerated engine. (lower psi) You'll have to see if you can find out what it's supposed to be at while running...sometimes you can check it without running the engine, and just putting the key to on to power up the pump. Obviously if it's out of range, and you've replaced the filter and regulator it pretty much leaves the pump or maybe even clogged injectors. Also a possiblity of a pinched fuel line. Did the fuel that came out of the old filter look funky?
Best of luck!
Saturday, May 20th, 2006 AT 5:34 PM