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Could it be fuel pump or something else

Tiny
TRJNHRSE30
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • 242,000 MILES
2000 silverado ls 4.8l v8 2wd. When reaches 4th gear at 40-45 mph starts to hesitate like it cant breathe or get gas. Step on accelerator to get passed 50 stops hesitating already changed out catalytic converter, 4 O2 sensors, rebuilt trans, egr valve, fuel system flushed, oil flush, spark plugs, wires. Only codes knock sensors are bad. All this in the last month and a half. Any help would be appreciated.
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Wednesday, December 14th, 2011 AT 12:03 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If the codes are knock sensors are badk check that. The knock sensors will retard the spark to take the knock away and the engine will run like crap. Either find the reason for the knock sensors bad like to much or little ohms resistance or a slight knocking noise that will set them off. They are under the intake manifold. You cold have a bad circuit as well.
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Wednesday, December 14th, 2011 AT 12:06 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Go to this link: https://www.2carpros.com/articles/engine-hesitates
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Wednesday, December 14th, 2011 AT 12:06 AM

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