1992 Ford Aerostar Rough idle, no power and engine light wo

1992 FORD AEROSTAR
205,000 MILES • 6 CYL • 2WD • AUTOMATIC
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RODENT042
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Literally out of nowhere my van developed these symptoms. Engine idles roughly and if I attempt to accelerate it bucks, sputters and backfires. The harder I push the slower it accelerates and the worse it runs.

The "check engine" light dims to almost unnoticeable while idling but actually gets brighter with the engine's rpms.
Jul 17, 2009 at 11:38 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 18, 2009 at 12:43 AM