Engine Performance problem
1995 Geo Metro 4 cyl Front Wheel Drive Automatic 98000 miles
accelerates in park, but in drive it barely goes down the road, even when pushing on the gas pedal, doesnt have any power, and its not the transmission, if it dont accelarates, like some stupid mechs say?
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