1991 Ford Mustang LX - Sputtering

[Blueinfan]

Hi All,

Reaching out to the Fox community for some assistance. The car started sputtering after I hit 2000RPMS. The more I punch it the more it does it but eventually it stops doing it

Engine is complete stock w/92.5k miles on it


New items -

1. MAP Sensor
2. Spark plugs and wires
3. fuel pump 255lph
4. new fuel tank
5. New fuel sending unit
6. TPS
7. EGR value
8. new air filter
9. Fuel regular
10. EGR value position sensor
11. Vacuum lines have been replaced and no leaks.
12. Distributor cap and rotor replaced
13. Ignition coil is new

thanks,
J

 

[90sickfox]

Sounds like a bad TFI module. The one on the side of the distributor. Rockauto has Motorcraft ones sometimes. I'd recommend going with a Motorcraft one but I've been using a standard motor products one for the last 7-8 years.

 

[Mustang5L5]

Have you dumped the engine codes to see if there is anything the ECU doesn’t like?

 

[General karthief]

Go through this checklist step by step:

Help me create the "Surging Idle Checklist"

Updated 05 July 2022 to add rough idle when cold and smooth idle when up to normal operating temperature. See the EGR tech information, section #15 for more help. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank...

www.stangnet.com

 

[Blueinfan]

Sounds like a bad TFI module. The one on the side of the distributor. Rockauto has Motorcraft ones sometimes. I'd recommend going with a Motorcraft one but I've been using a standard motor products one for the last 7-8 years.

Is one better than the other?

 

[Blueinfan]

Have you dumped the engine codes to see if there is anything the ECU doesn’t like?

I'll do that today at lunch at noon.

 

[90sickfox]

Is one better than the other?

Yes. Motorcraft is the best. Even a used Motorcraft TFI from the JY is better than half the aftermarket ones.

 

[Mustang5L5]

Yes. Motorcraft is the best. Even a used Motorcraft TFI from the JY is better than half the aftermarket ones.

It’s a sad state of affairs when we typically recommend someone go to a junkyard and find an oem TFI on a car, vs using the junk that is sold today.

 

[Blueinfan]

It’s a sad state of affairs when we typically recommend someone go to a junkyard and find an oem coil on a car, vs using the junk that is sold today.

I try not to buy from the JY unless I really have to. I learned my lesson and buy new now.