4.0 major problems

[rathranger]

I have a 96 4.0. it's idling around 700 and jumps around alittle. it seems to be burning oil and is misfiring really bad. when i hit the gas it won't idle up and sometimes dies.but it will run like this for a few minutes then be fine.
I am not driving well doing this just sitting in park. also sometime it will be idling fine but then just die.

HELP!

 

[birdman]

is your engine light on?
Mine is doing the same thing and has been for a few weeks. but mine only does it when its cold outside. I first changed the IAC, didnt help, and now my computer is saying EGR so i have to change it, if its not that then i thin mine is then fuel rail gasket

 

[rathranger]

yes CEL was on showing P171 and p174. running lean in bank 1 and 2

 

[rathranger]

i ran the truck today, i can make it idle up if i go real slow with the pedal. it seems to be blowing out a lot of black. my exhaust tips are black, and so is the snow bank i'm parked next to. i don't know if this is excess fuel or oil. I have some problems since i got my programmer im not sure if this would be from that?

 

[Rudie Del Rude]

Pull your plugs and see if there's oil on em. If you find some with oil on em pressure test those cylinders to see if its a head/gasket or ring leak. If not it could be your valve seals or maybe a really bad intake manifold gasket leak.