1998 Chevy Blazer misses out

1998 CHEVROLET BLAZER
130,000 MILES • V8 • 4WD • AUTOMATIC
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LUCKIE9
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When the speedometer gets to 40-50 mph, it misses out. Not like transmission problems but on the odometer it jumps, stalls kinda. And of course it doesn't happen every single time. Please help.
May 27, 2009 at 7:14 PM
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RASMATAZ
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Misfiring 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.
May 27, 2009 at 7:57 PM