2003 Ford Ranger jerking

2003 FORD RANGER
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RARA
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Engine Mechanical problem
2003 Ford Ranger 6 cyl Two Wheel Drive Automatic

driving on the road cant past 80 mph it jerks ,cant drive with cruse control when it gives gas it jerks drives good when your on 70 ,when i need to past a car i give gas to boost it jerks any idea ?? i been told it was a spark plugs wiring and a relay on the top of the carb vents
Jul 25, 2009 at 11:21 PM
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RASMATAZ
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Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
Jul 25, 2009 at 11:24 PM
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RARA
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new motor has been installed so basily everything else is in good working conditions????
Jul 25, 2009 at 11:29 PM
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RASMATAZ
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New engine but is the engine management system in order. I recommend you check what I've gave you and comeback with some results before we move on.
Jul 26, 2009 at 1:54 AM