2004 FORD MUSTANG
92,000 MILES
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RON TRICKER
  • MEMBER
  • 2 POSTS
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. ???????
Dec 15, 2012 at 2:29 PM
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ASEMASTER6371
  • CAR REPAIR CONTRIBUTOR
  • 52,796 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
Dec 15, 2012 at 4:06 PM
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RON TRICKER
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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.
Dec 16, 2012 at 5:53 PM