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

1995 CHEVROLET S-10
94,000 MILES • 4 CYL • 2WD • AUTOMATIC
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S10MIKEY
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  • 1 POST
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
Aug 28, 2009 at 1:53 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 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
Aug 28, 2009 at 2:24 PM
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