1995 Chevy S-10 surging at freeway speeds 60 to 70 mph

S10MIKEY

MEMBER
1995 CHEVROLET S-10
4 CYL
2WD
AUTOMATIC
94,000 MILES

The truck after it gets warm starts to surge at or around 60 to 70 mph. It feels like it might be a lean condition, it has a warm smell to it. The temp gauge is 180 during this time. I have looked into leaking vacuum lines but none found. I'm thinking injecters, 02 sensor let me know what you think thanks

Friday, August 28th, 2009 AT 8:53 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

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

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Friday, August 28th, 2009 AT 9:24 PM