HELP!!!! my truck keeps stalling while im driving. i have put a new brain box, battery, crank sensor, spark plugs and wires, coil wire and pcv valve in. the mechanics have replaced other sensors but they dont know what is causing the stalling. it is intermittent and its driving me crazy.

 

Could be a couple things, fuel pump comes to mind first though.

 

Could be many things. Is the check engine light on? Auto or manual? How many miles?

 

check the tps is it stepping up and down smoothly???

 

pull your cap and check the rotor also. Wont hurt

 

the check engine light is not on. its an automatic and it has 185000 miles

 

When you say "Stalling while driving" do you mean it goes completely dead while you are in motion or stalling at a slowdown or stop??? More info. needed, your mechanic must not be diagnosing problems well if he is throwing parts at it and its not working to solve the problem.

 

it stalls on and off. lately it has been while i was slowing down or stopping but it still does it while im in motion

 

TPS does not step. IAC is a stepping motor, the TPS is a potentiometer. Ceck with ohmeter to see if resistance change is smooth with no interuprions throughout range.



Check fuel pump as mentioned above.

Got manual? (FAQ/DIY section - Service Manual Download)