Hey guys,, Been havein problem with my D now on keeping it running an acts like its running out of gas when I push the gas pedal to go,, Took my D over to Auto Zone an they test it with there lil tester but its not showing nothings wrong,, I unhook the elc. vac unit that is on the back side of the throttel body,, it seems to run better because it idels up a lil higher,, So I bought the new part an put it on an still haveing the same problem,, When it sets there running then it starts up great an after a couple mins then the RPM gauge starts going up an down till sometime it dies out or smooth back out then starts all over again,, It kind of feels like there is water in the gas an when I do rev it up then the motor goes up an down like there mite be water,, Now I do know my wife didn't keep gas in my D an the gas light came on but the D was still running great, I went down an put 40 bucks worth of gas in it, Drove it about 10 miles then back home an parked it, Next day I drove it about another 10 miles an no problems at at when I got there an shut it off for about 3 hours then when I started it back up to come home this is how its been running since an been 3 days now,, What would be next thing to check,

 

which engine is in the truck??

it almost sounds like you have a sticky IAC motor (its on the back of the TB), if not that maybe TPS or a vacuum leak

 

Sorry bout that,, It has the 5.2 eng. in it

 

Start with a good tune up plugs, wires, cap and rotor.

 

Hey dolittle I did a tuneup just a lil while back an it still good,, shrpshtr325, What is the IAC motor,,An Tb ??

 

tb is throttle body, IAC is Idle Air Control, its a little plunger style motor which mounts on the back of the throttle body

 

Oh ok,, I did replace the IAC that is on the back of the TB,, I still have the same problem, I started my D up this morning an it ran great for almost 5 mins then started lopeing again,, Its like when the motor starts warming up just a lil then it starts this,, I can't find a vac line leaking no where's yet but still looking,, I goin to go out an start er up again an spray a lil water around the TB an see if it does anything,,

 

Thought this might help:

 

Glad to hear from you oldschool,,, I did check the vac lines you have here an there all good,, The lil smallest vac line that goes to the heat/AC when I moved it then it snaped on me,, I went to AutoZone an got a new hose an replaced it,, But it didn't help none, I going to get a new TPS in morning an see if thats the prob or not,, I just have to ask this silly qustion right fast,,lol,, I did put my new mirros on my D an they have the elc heat in them,, Well I didn't use the defrost till the day this started happening, I wouldn't then this would had nothing to do with my eng ??? I hope I am right cause if I am wrong then there mite be something wrong with my new PCM box thats only about 5 month old now

 

the heated mirrors would not have any effect on the engine running