in need of help about my engine

[madwilly]

ok just got this 1994 ford ranger 4.0 v6 its a nice truck with some damage i ended up trade my old 1985 toyota pu for it and now the engine is going nuts it keeps boggin out on me now at 3 grand and 4.5 grand and i dont know what the heack is going on. i have replaced the mass air flow sensore the throttle position sensore the starter and new plugs gapped and everything, but it still wont run properly i have had a couple people think it may be the coil pack and or the fuel filter but there both new and in good shape so i have run out of ideas the darn thing wont run to save my life now it just turns over runs for about 5 seconds shakes boggs out and then dies so any ideas from anyone

 

[babytruck]

cats clogged? i dont know weird???

 

[BlackBII]

Pull the codes.
http://www.therangerstation.com/tech_library/OBD_I.html
http://www.therangerstation.com/tech_library/2digitcodes.html

Does it do it when cold? When hott?
At all speeds?
Under all loads?

Need more descriptive info on when and how it happens