1996 Chevy Astro rough idle

1996 CHEVROLET ASTRO
210,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CHEVYDAN875
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  • 1 POST
hi i have a 96 chevy astro with 200000 miles ..its a great truck ,but i keep getting a cylinder 3 misfire . it idles rough and has a smell of raw fuel.. i have changed everything i can think of ...IE ..injectors (spyder), fuel filter, plugs ,wires ,cap, rotor ,distributer, egr valve, mass air flow censor, air temp censor,....Compression is good around 150 on all cylinders .. please help..
Jun 10, 2010 at 7:44 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Did you inspect the no.3 poppet valve? also the camshaft position sensor side of the distributor

Engine running rough or misfiring can be cause by the following:

1.Defective spark plug
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors/circuit
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Idle air control valve.
Jun 10, 2010 at 11:34 AM
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