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could be lots of things but without more info on it hard to tell but here's a few things it could be,1. plugs are bad 2. fuel injectors need to be purged. 3. could be a piece of crud stuck in your egr valve. 4. low compression on one or more cylinders. or many other things but these are most common. hope this helps.
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∙ 13y ago
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Why does Chevy S10 have a rough idle after replacing the fuel pump?
change fuel filter under the driver side bolted to the frame
96 Chevy s10 4cylinder running at high idle and will not kick down?
If this happened all at once, check the vacuum lines. A cracked or broken line will cause high or rough idle.
Your Chevy s10 oil gauge sits at 20 when you idle is that normal?
Yep!
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check for a vacuum leak.
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how to change front shocks in 01 Chevy s10
What would cause your 2.2L 1996 Chevy S10 to have poor acceleration and a rough idle?
It may have worn spark plugs and or bad spark plug wires, time for a good tune up.
When should you change the timing belt on a 2000 Chevy?
A 2000 Chevy S10 does not have a timing belt.
Chevy s10 1993 that stalls on idle What could be the reason?
throttle positioning sensor, egr, idle air control
Will a 2000 Chevy s10 blazer 4x4 transmission work for a 1998 Chevy s10 blazer?
Will a 2000 blazer transmission fit a 1998 s 10 chevy 4x4 truck
Will an alternator from a 2000 Chevy blazer fit a 2002 s10 blazer?
An alternator from a 2000 Chevy blazer will fit a 2002 S10 blazer with a little fabrication.
Does the vehicle speed sensor control the idle in a Chevy blazer s10 1989 2.8?
No it does not.
What might cause your 1989 Chevy S10 to idle fine when cold and idle rough when at operating temp?
Check to make sure the EGR valve is operating properly. BTW, that's different than the PCV valve so don't get them mixed up.
