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
  • 45,727 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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