I start my truck and let it idle for a little bit its smooth but maybe 30 secs it drops and idles rough but then check engine light comes on. Everytime doesnt fail. the MAF and TPS seem to be good. Could it be the Ignition Control Module? How would u check if that is what is bad... Any other ideas throw them at me.

PLEASE CREATE A VEHICLE PROFILE LIKE MINE SO WE KNOW WAHT WE ARE WORKING WITH

I doubt it is the icm. you need to read the codes and post the actual numbers here..........what do you mean the maf and tps seem to be good. did you clean the maf or even look at? Do you have an aftermarket air intake?

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

In addition to all of the above, I would put money on pulling the IAC and TB and cleaning them will fix the problem.

__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide

94 2.3L Ford Ranger Manual 5 Speed.
31's on 15's
3.5 Lift Front
3 in Rear..

And yes pulled and cleaned Both.

Ok. Again without knowing the trouble codes, its hard to diagnose. You need to read the codes and post what they are. If you don't have a code reader, most autopart stores have them and will read them for free.

__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide

Deadokie 21. What Brand Refrigerator do you have?

__________________
2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

I doubt it is the icm. you need to read the codes and post the actual numbers here..........what do you mean the maf and tps seem to be good. did you clean the maf or even look at? Do you have an aftermarket air intake?

__________________
2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

Maybe this went right over my head, but what do kitchen appliances have to do with a check engine light??

__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide

Nothing. I was just being a wise guy because of what I perceived as sub par feedback

__________________
2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

Ive tried to get the code reader.. i eather gotta buy one or find someone who has one.. stores here got into some trouble with them ( what the workers told me) lawsuit or sum bs. So tryin to just get the best idea as to what could cause it i still gotta clean the IAC.

And i dont know the brand of my fridge lol :P

So you need to spray the inside of the throttle body with throttle body cleaner not carb cleaner. You need to pull the MAF and spray the filament with a can of MAF. Cleaner. Then pull the IACV off and clean the Cavity out with one of those cleaners. Those are all maintenance items. Then get a code reader I got a Codekey reader at Costcos for $20. DO YOU HAVE AN AFTERMARKET AIR INTAKE?

__________________
2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

No aftermarket intake. all stock under hood.

Have you replaced your fuel filter?

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2003 Ford Ranger 2wd, 2.3L 4-cyl.