1999 Chevy Tahoe Engine seems to miss-fire

Tiny
LANELLEB
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 270,000 MILES
Recently, my engine was running rough, and was diagnosed with #5 cylinder mis-fire. All the spark plugs and spark plug wires were then replaced, and it seemed to run better for a while. Valves started clicking, so added Risone to the oil to see if that will help to silence the clicking noise. Now, the engine runs extremely rough when putting any kind of load on it. It seems to idle fine, but when I drive over say, 35 MPH, it "misses" really bad. The Service Engine Soon light comes on, and blinks 13 times. Any idea what's happening?
Wednesday, September 8th, 2010 AT 1:09 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0305-check the sparkplug, compression and injector for cylinder no.5

1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
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Wednesday, September 8th, 2010 AT 8:59 AM

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