weak 4.0 engine

[tonyjklh]

i know it has nothing to do with the oil but you could try a fuel pressure regulator. my 92 blew through one it was causing huge loss in fuel ecomomy and power, also somehting as small as a fuel filter makes a world of differnce, my friends 77 camaro would just die around 90 km's/h and the fuel filter made her purr

i havnt tried a pressure regulator mostly because i think when they go bad the engine starts sucking fuel through the vacuum line going to it.
i have changed the fuel filter as well as all the other tune up items.

i think it is running to lean, the spark plugs are all very white when i pulled them.