1984 mustang 5.0 EFi wil occasionally sputter act like it's not getting fuel or firing

Asked by Sep 08, 2015 at 09:13 PM about the 1984 Ford Mustang GT Convertible

Question type: Maintenance & Repair

First noticed on longer trips, 1 hr, (and after running a can of seafoam through tank) While driving RPMs will drop like it's not getting fuel. Sometimes can last for a mile or two at 60, then straighten out and run fine for another 50 miles. Tried the old clothespin on the fuel lines trick. Seemed to make it less severe happens more often, but doesn't last as long. Also idles at about 1100 rpm, occasionally idle will fluctuate 300-400 rpms while idling the clear up and be fine. Car has been in storage, less than 2000 miles in the last 7 years. Have replaced the fuel filter. I think this is a two filter system. Saw what appears to be electric pump near filter while changing it.  Is this a fuel problem or electrical?  car has 167,000 miles

3 Answers

That should say a "two pump system"

254,535

Since the car was in storage, was the fuel drained and replaced? Carb rebuilt yet? Cars don't like sitting around. Check your normal things like plugs and wires, cap and rotor and vacuum lines as well.

1 of 1 people found this helpful.
41,255

Sounds like you may have the same issue that the older Cabriolets had. The fuel pump strainer in the tank picks up rust and it plugs it up. After you shut the car off, the rust will fall off the screen. Then after driving it for a while, the strainer will become plugged again and the car will begin to stall or feel like it's running out of gas.

1 of 1 people found this helpful.

Your Answer

Mustang

Looking for a Used Mustang in your area?

CarGurus has 38,332 nationwide Mustang listings starting at $895.

ZIP:

Ford Mustang Experts

  • #1
    Tom Demyan
    Reputation
    4,590
  • #2
    Bob Beaman
    Reputation
    1,260
  • #3
    COMETGUY61
    Reputation
    1,110
View All

Related Models For Sale

Used Chevrolet Camaro
425 Great Deals out of 30,915 listings starting at $3,550
Used Dodge Challenger
301 Great Deals out of 22,416 listings starting at $6,999
Used Dodge Charger
451 Great Deals out of 28,015 listings starting at $1,979
Used Chevrolet Corvette
296 Great Deals out of 20,714 listings starting at $2,990
Used Ford F-150
2,323 Great Deals out of 184,535 listings starting at $699
Used BMW 3 Series
1,172 Great Deals out of 33,355 listings starting at $1,000
Used Honda Civic
814 Great Deals out of 73,913 listings starting at $1,400

Used Cars For Sale

2014 Ford Mustang GT Convertible For Sale
3 Great Deals out of 64 listings starting at $19,478

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.