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rpmdiag, Tech and Instructor
Category: Ford
Satisfied Customers: 6710
Experience:  Since 1975
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I have a 2002 sport trac with a 4.0L engine. when i start

Customer Question

i have a 2002 sport trac with a 4.0L engine. when i start it, it runs up to about 3,000 ROM and then goes to a very rough idle. then shuts off. it will try to stay running f i keep my foot on the gas. i recently replaced the throttle control sensor.
JA: Is the rough idle intermittent or consistent?
Customer: consistent, then it dies after less than a minute
JA: What is the model of your '02 Ford?
Customer: sport trac
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: i am doing the repairs myself. the only thing i have tried is to clean the Mass airflow sensor.
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 2 months ago.
Category: Ford
Expert:  rpmdiag replied 2 months ago.

Hi, welcome to Just Answer. I’m Ron and I’ll be helping you
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

You need to check the fuel pressure with a gauge, sounds like it's starving for fuel. Most parts stores will loan you a gauge for a deposit, tell you how to attach it and the pressure specs.

Thanks, Ron