1998 Chevy Blazer engine miss at low idle when drive

JBROCK6116

MEMBER
1998 CHEVROLET BLAZER
6 CYL
4WD
AUTOMATIC
160,589 MILES

Yes my s-10 blazer when you drive at low idle the rpm will jump down and go back up, the transmission feels like it is staying in high gear all the time at a slow speed like gonin through a small town, but when you get to 30mph it dont do it could it be the torque sensor

Thursday, January 14th, 2010 AT 8:20 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Check and test the following below

Oxygen sensor
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
Cap and rotor

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Thursday, January 14th, 2010 AT 11:06 PM