2001 Chevy Silverado Random Cylinder Misfire on Chevy 1500

2001 CHEVROLET SILVERADO
154,000 MILES • 6 CYL • 2WD • AUTOMATIC
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ZUPCHESH
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Not sure what the problem is on my truck. I had a random cylinder misfire code, so I replaced the plugs, wires, cap/rotor ... that didn't fix it so I replaced the actual distributor. Still not fixed. The truck runs fine at lower speeds but when I get on the highway and accelerate it runs really loudly and won't get up past about 65 mph. Check engine light starts flashing at higher speeds. I thought for sure the tune-up would take care of it but no such luck. Any ideas?
Nov 1, 2010 at 10:36 AM
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RASMATAZ
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Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
Nov 1, 2010 at 10:38 AM
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ZUPCHESH
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Yeah I did that, the code is still coming up as a random cylinder misfire ... the same as it was when everything first started.
Nov 1, 2010 at 10:43 AM
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RASMATAZ
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P0300 is normally caused by vacuum leaks and contaminated fuel-
Nov 1, 2010 at 10:45 AM
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ZUPCHESH
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any suggestions on repairs? thanks for the help/diagnosis
Nov 1, 2010 at 10:47 AM
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RASMATAZ
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Start by checking all the vacuum hoses and check the fuel pressure if it within specs -also try running Seafoam thru the fuel system and see what happens
Nov 1, 2010 at 10:52 AM
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