92 3.9 2wd auto..Seems as though it is running out of fuel.It's getting worse.sputters and "pops" like timing also but If I give a little more throttle it comes out of it then it's fine again for awhile.I've recently done a complete tune-up(plugs,wires,cap,rotor)Also changed fuel and air filters.Did have a bad injector wich I replaced and all was fine till about 1 week ago.This problem is getting worse but have no idea where to turn next...Oh,I also just changed the air intake temp sensor wich made a great improvement in the overall run but this other issue still remains and is getting worse..Could this be the fuel pump failing?

 

Did you check the fuel pressure? Did you check for vacuum leaks?

 

any funky smells? maybe a clogged cat converter?

 

No smells cat is fine.Has a newer exaust system the previous owner put on.Will have to wait till after the holiday but will get a pressure guage and check the fuel pressure.

 

Truck still in the garage. Fuel pressure came back good.Very actually,holding strong between 38-42psi.All have been changed.The throttle position sensor, Air charge temp sensor,speed senor and the MAP sensor.Previous owner wasn't very nice to it and they needed replacement a long time ago.Truck will idle fine all day but when driven acts like it's running out of fuel.I was thinking bad throttle body but then again would'nt it run bad all the time?Took it to a local (and trusted) mechanic wich I hate doing but even he cant figure it out.Im hoping someone else has had this issue and could give me some direction..I'm lost without my truck.Luv my Saab also but come on...It's a truck,lol...Thanx for the help guys.