Mechanics

ENGINE RUNNING ROUGH AT HIGH SPEEDS

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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Capebart51
July 10, 2012.




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.

Tiny
Hmac300
Jul 11, 2012.


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