I HAVE THE 3

  • Tiny
  • Ron Tricker
  • 2004 FORD MUSTANG
  • 92,000 MILES

I have the 3.9 6-cyl, it runs fine but when you are cruising 55-60 and hit a small hill or incline and start to put a load on the engine it will start to cough occassionally and miss, But, if you kick it down and run it hard it has no miss at all. I put a can of Seafoam gas treatment in it with 6-gallon of 92-octane and it helped it quite a bit. ?

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Saturday, December 15th, 2012 AT 2:29 PM

2 Replies

  • Tiny
  • ASEMaster6371
  • EXPERT
  • 25,554 POSTS

Gas tank additive rarely work. Direct injection of fuel cleaners are the only method that works.

It does sound like an injector issue.

Check fuel pressure.

Roy

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Saturday, December 15th, 2012 AT 4:06 PM
  • Tiny
  • Ron Tricker
  • MEMBER

Can you tell me what the pressure should be, and how to check it, with the engine running, or just with the key on, or what, And I also want to thank you for you answer.

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Sunday, December 16th, 2012 AT 5:53 PM

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