Hello... i have a 05 silverado with a 4.8l auto trans 137k mile... I have a real bad power loss on take off and if i have the truck in ANY gear with the brake on it starts to knock like a diesel REAL bad but only in gear! In nuetrel or park you could rev it as high as u want and it goes through smooth and clean...no check engine lights untill now a p0449 evap code that i think is a seperate deal? I have changed the knock sensors spark plugs and crank sensor..... Still stuck with the same problem, has anyone seen this or know whats going on here? THANK YOU!
felix05
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It could be a problem with the transmission or the torque converter clutch. The clutch my be staying locked up, causing your problems. It could be a bad converter itself, or the solenoid/electrical system that diverts fluid pressure to it to apply it. Have someone with a diagnostic scanner test for transmission codes. Sometimes the code readers will not read the transmission codes.
thanks for the reply! that is the last thing im on now, i have changed the knock sensors, spark plugs, crank sensor and the10gal. of fuel i jad just put in prior to problem occuring and it ended up being good fuel! the transmission fluid smells fine and looks like normal fluid... im stuck! 
i was hopeing some one has gone through this before... No check engine light and when we ran a scanner it only came up with a reading of possible bad crank sensor...
i was hopeing some one has gone through this before... No check engine light and when we ran a scanner it only came up with a reading of possible bad crank sensor...Plus getting p0300, p0122, p1122 code. My scanner shows my evap systems monitor as red when everything else it green. Im not getting it. Have to drive 3 hours for work next week fully loaded with tools and materials. Dont want to break down and let the crew down and look like an ass. KnN intake ,super 40 flows are only mods. (tuner for xmas).Thank boys
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