1991 Chevy S-10 miss or hesitation at high speed

ZELLER38

MEMBER
1991 CHEVROLET S-10
6 CYL
4WD
AUTOMATIC
150,000 MILES

When I get to 60 mph or so if the engine is under load it starts to hesitate. Will run ok if I let off the gas a bit. I first noticed it about a month ago pulling my boat. Then it went away. Now it is happening all of the time if I accelerate after I hit highway speed. I can punch it and downshift and it will still pick up speed but will hesitate the whole time. Feels like my outboard when I drop a cylinder. I changed the fuel filter and it didnt help. It seems to do it less if I run premium. Any ideas.

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Hi zeller38, Welcome to 2carpros and TY for the donation-this is what keeps the site going.

Lack of acceleration, chugging, hesitating, jerking, bogging, misfiring etc. Could be caused by one of the following below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it.

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Sunday, September 12th, 2010 AT 10:28 PM

ZELLER38

MEMBER
3 POSTS

I thought it would be one of the things you listed. I had hoped by seeking someone with experience with s10 in the past they would be able to give me a more likely option. I thought there may have been something that is more often the culprit. I will have to take it in. I have a form of als and have limited use of my right side and hands now. I am not able to check many of the areas you listed.

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Sunday, September 12th, 2010 AT 11:41 PM

RASMATAZ

MECHANIC
75,992 POSTS

Every item I've mentioned can cause hesistation, you can try the throttle position sensor and manifold absolute pressure sensor for a start this problem can drag on and its right underneath our nose

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Sunday, September 12th, 2010 AT 11:47 PM

ZELLER38