Truck stubs at idle and sometimes dies? Horrible gas mileage and lack hiway speed I've checked for vaccum leaks with engine running and carb and choke cleaner nothing came up a few months ago I did a complete tune and a new fuel pump its a 5.8l 96 po171code would it be a bad 02 senor? They are the factory ones truck has 145000 on it

 

Don't know the code but those symptoms seem to indicate a bad o2 sensor. Google the code, o2 sensor is $30 on rockauto.com

 

Looking for vac leaks with carb and chock cleaner is a **** poor way to find leaks,go get a vac gauge. Get one with the hand pump on it. The only thing that I spray is the intake gasket. po171 is system too lean. Test vac and map first.

 

Ok so I replaced both front o2 sensors helped the idle out but it just seems guy less and sluggish ill check vaccum better

 

Wow i'd hate to hear what you think of my dual purpose dawn/water mix. I find and fix intake leaks and clean at the same time! Can your hand pumper do that?

 

No telling how many leaks I've found over the years with carb&choke cleaner glad I found out I've been doing so **** poor all these years..lol

 

It works if u hit the leak. Some of the vac lines are covered and it don`t work with the plastic cover. If you miss it and move on thinking your done testing your yet to find the leak. There are only about 7-10 lines to test any way. Can your dawn and water test the map or egr? The hand pump can. Do as you please.

 

a whole bank of Lean injectors can be a bad O2 sensor but beings you replaced that it can be a bad ground and that circuit is going bad in the ECU....

 

My book tells me the system is lean ,not just one of the banks.

 

or a bad ground causing low voltage return on the sensor(s) which would trip a lean code...