I have a 2001 3.8 L mustang, it sat for about a year tried to start fuel pump out, ran great previously. Replaced fuel pump motor only, cleaned tank changed fuel filter and it ran great for about 60 miles. All of a sudden running rough misfires, knocks rough idle. Replaced all plugs, coil pack, EGR and 2 injectors (3-4)which showed misfire on diagnostic. First start idles great feels smooth after 15 minutes same conditions occur, sooner when driving. What should I test the fuel pressure again?

Asked by Nov 12, 2015 at 09:06 PM about the 2001 Ford Mustang Convertible

Question type: Maintenance & Repair

Car sat for a year had to replace fuel pump and filter ran great as it did
previously. After 60 miles started to idle very rough, misfire, knocks bogs down
when giving gas had to feather gas pedal to accelerate. Showed cyl 3-4 misfire   
changed 2 injectors, all plugs, coil pack, EGR. Idles smooth for about 10
minutes then idles rough, worse when driving same symptoms as above. Bad
fuel pump again?

2 Answers

83,265

Your fuel system may be all gummed up. Run some Seafoam in the gas tank and some Heet water remover as well. It may take a few tanks to clear up the problem.

2 of 2 people found this helpful.
75,595

Use the Red Heat bottle...it has isopropyle that would break down any water that may have collected from condensation.

1 of 1 people found this helpful.

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