Try a few if these ideas...
Priority Action Part Type Cause
1 Inspect Spark Plug Fouled, Damaged, or Broken Spark Plug(s).
2 Inspect Hose (PCV) Clogged or Collapsed PCV Hoses.
3 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s).
4 Inspect Distributor Worn, Damaged or Faulty Distributor.
5 Inspect Catalytic Converter Clogged or Faulty Catalytic Converter.
6 Inspect Fuel Pump Low Fuel Pressure.
7 Inspect TimingSet Slipped TimingChain or Worn TimingGear(s).
8 Inspect Knock Sensor Improperly Connected or Faulty Knock Sensor.
9 Inspect M.A.P. (Manifold Absolute Pressure) Sensor Faulty M.A.P. Sensor.
10 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor.
11 Inspect Mass Air Flow (MAF) Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
12 Inspect Air Cleaner Temperature Sensor Damaged or Faulty Air Cleaner Tempature Sensor.
13 Inspect Fuel Injector Pressure Regulator Faulty Fuel Injector Pressure Regulator.
14 Inspect Piston Ring Set Worn or Broken Piston Rings.
15 Inspect Timing Specification Incorrect Ignition Timing.
16 Inspect Fuel System Pressure Incorrect Fuel Pressure Being Delivered to Carburetor or Fuel Injection System.
17 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
18 Inspect PCV Valve Plugged or Damaged PCV Valve.
19 Inspect Valve Burned, Worn, or Sticking Exhaust Valves.
20 check idle stop solenoid - if faulty, could cause rough idling
21 inspect distributor cap/rotor - if burnt, could cause loss of acceleration
SOURCE: ROUGH IDLE AND ROUGH EXCELERATION?
Two very common things come to mind.
That can be caused by a dirty air filter. A clean air filter insures that the engine is getting the right ballance between air, and fuel. Crucial for engine performance.
If that doesn't resolve your issue, you may want to have the, " Idle air control valve ", checked.
This part, for most vehicles, costs between $50.00, and $80.00.
I hope this helps you.
SOURCE: my engine occasionally misses and a rough idle
My 1993 caprice had the same issue.
Would it happen to down shift out of overdrive on the slitest incline.
if so, one of your plugs is missing under load. Mine turned out to be a wire.
Testimonial: "thanx expert... the plugs are newish , so i'll try the cap and rotor and the wires..hopefully that will fix the problem"
http://howtobyme.blogspot.com/2011/12/car-still-runs-rough-after-tune-up.html
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2006 kia rio runs rough
http://technoanswers.blogspot.com/2012/10/2006-kia-rio-runs-rough.html
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Idle flair is noticed on car? Rough idle? car will not idle?
Erratic idle speed?
http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
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Rough idle, staling and Erratic shifting?
http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
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These details will help.
Thanks.
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