ENGINE RUNNING ROUGH AT HIGH SPEEDS

  • Tiny
  • Capebart51
  • 1999 Ford Ranger
  • 30,000 miles

99 Ford Ranger 300k miles but well kept. 90% of miles are highway. Changed oil/ 3000 miles. Started to run rough no past history of this. Thought I got bad gas, changed fuel filter plus high octane gas with two bottles of dry gas. Seems better but not 100% right. When driving up steep grades have to shift down to make grade also in 4th or 5th gear around 60+ mph it feels sluggished had tune up month prior to this issue. Any ideas? Thanks

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Tuesday, July 10th, 2012 AT 11:27 PM

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  • Tiny
  • hmac300
  • Expert
  • 44,361 posts

Scan for codes and check fuel pressure first. With engine running it shoud be 47-63 minimum with keyoff engine off it should be 55-65 psi.

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Wednesday, July 11th, 2012 AT 12:06 AM

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