could it be fuel pump or something else

2000 CHEVROLET SILVERADO
242,000 MILES
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TRJNHRSE30
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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...
Dec 14, 2011 at 12:03 AM
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HMAC300
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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.
Dec 14, 2011 at 12:06 AM
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RASMATAZ
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Go to this link: https://www.2carpros.com/articles/engine-hesitates
Dec 14, 2011 at 12:06 AM
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