2000 Chevy Silverado Engine missing

2000 CHEVROLET SILVERADO
110,000 MILES • V8 • 4WD • AUTOMATIC
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4CATRINA
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I had just had the catalytic converter and one O2 sensor replaced. Now when i drive and the speed gets to around 55-60 mph, the engine starting missing. I had put a scanner on but got no TC codes to indicate a problem. The O2 sensor that I had replaced was Bank 2 (upstream). I had already checked for vaccum leaks but found nothing. Any help would be appreciated.
Jan 24, 2009 at 5:49 PM
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RASMATAZ
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Engine misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
Jan 24, 2009 at 6:10 PM