2004 Chevy Silverado Shaking and pulsing while driving

2004 CHEVROLET SILVERADO
52,300 MILES • V8 • 4WD • AUTOMATIC
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RDSPIKE1
  • MEMBER
  • 1 POST
I have a 2004 Silverado extracab w/ 52000. Recently, after the vehicle has warmed up, it shakes/pulses (like going over a rumble strip) between 40 and 55 mph. It goes away if let off the gas or give it the gas to accelerate. Acceleration is fine, I even punched it from a start to 60mph no problem. In park I put it thru the rpm range with no problem. The engine light is not on/its not sending codes and my mechanic says its not rotors or suspension and is stumped!
Help! Thanks.
Dec 1, 2007 at 1:56 PM
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PEAR69
  • ✓ASE Certified Mechanic
  • 1,482 POSTS
  • ASE Certified Mechanic
Check for sticking exaust valve. Change fuel filter. Check for clogged cat. converter. Clean injectors. Check for vaccum leak.
Dec 2, 2007 at 9:27 AM
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