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Fluctuating RPM while driving - '95 4.3 CPI

 
 
 
 
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Old 08-28-2006, 12:50 PM
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Join Date: Nov 2005
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Default Fluctuating RPM while driving - '95 4.3 CPI

The vehicle is a '95 S10 Blazer, 4WD - 4.3 CPI

I recently installed a new fuel pump and filter, EGR, plugs and O sensor. At speed 45-55 mph the RPM's fluctuate +/- 3-400 RPM causing a slight surging - the ride is not smooth.

Any ideas or direction I should go in?

Many thanks in advance of your responses.
 
  #2  
Old 08-29-2006, 01:05 AM
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Location: Central Illinois
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Default RE: Fluctuating RPM while driving - '95 4.3 CPI

Sounds like your torque converter is locking and unlocking. Why?
Take it to AutoZone and get it scanned for codes.

Also, are you driving with your foot on the brake pedal? DONT
 
 
 
 
 
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