2000 Pontiac Grand Am stuttering

RYAN52391MM2

MEMBER
2000 PONTIAC GRAND AM
4 CYL
FWD
AUTOMATIC
113,000 MILES

When ever I first start my car and put it in drive, when I press the gas my car will stutter for a second then drive normally. It also happens sometime while im at a stop light, my car will just stutter likes its gunna die but then drive normal. Theres no indication of power lose while im driving, just after stopping. I checked the cat but it wasnt that. Do you have any idea what that might be?

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Do you have a check engine light and when was the last tune-up? Lacking acceleration then catches could be one of the following below

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