• Tiny
  • El Cheapo
  • 1999 Chevrolet Suburban
  • 131,000 miles

We have a random misfire condition which includes an intermittent engine shudder, usually when pulling inclines under load, on the 1999 Chevy Suburban (1/2 ton, 4WD, automatic, 131,000 miles). The following services were performed on the car:

• Replaced fuel tank sending unit – 65,434 miles
• Replaced fuel pump and connector – 80,505 miles
• Replaced the fuel filter – 88,771 miles
• Complete engine tune-up (spark plugs, rotor, distributor cap, ignition wire set, PCV valve) – 92,804 miles
• Repaired faulty ground wire on the engine block
• Replaced distributor cap, rotor, wires, spark plugs, complete fuel injector assembly – 122,869 miles
• Replaced ignition coil – 130,000 miles

Nothing has helped, and now it feels like it briefly cuts in/out (literally a split-second flicker but will do it several times in a row) while driving on flat road @ 45 mph. At one point recently, the engine was misfiring badly, and I was down on power that it felt like I was braking not accelerating. I pulled over and without warning, it self-corrected and drove like a well-oiled machine. This has happened several times, but the engine self-corrects its misfire and drives fine.

I checked all the fuses, air filter, etc, but there are no apparent problems. What else should we check?


Do you
have the same problem?
Sunday, June 16th, 2013 AT 5:38 PM

1 Reply

  • Tiny
  • hmac300
  • Expert
  • 44,912 posts

Have a pro check this, random misfires can be caused by several things an dhe needs to scan to see if any sensors are out of whack

Was this
Monday, June 17th, 2013 AT 5:31 AM

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