ENGINE RUNNING ROUGH AT HIGH SPEEDS

1999 Ford Ranger

Tiny

Capebart51

July, 10, 2012 AT 11:27 PM

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

FOUND 4236 RELATED QUESTIONS

Running Rough

27 ANSWERS
34 IMAGES

Idles Rough/changed Ects

37 ANSWERS
3 IMAGES

1 Answer

Tiny

hmac300

July, 11, 2012 AT 12:06 AM

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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