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Got on Chevy website and reassured that it was crank sensor..was setting 0300 random misfire..changed crank sensor and does same thing but pulls 0336 code. Engine has 290,000 and could a stretched timing chain throw off parameters and stop firing? Fuel pressure around 60 psi

Vehicle: 2004 gmc Sierra ,4.8l

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P0336 Crank position sensor "A" circuit range perfromance

When you have a P0336 this mean that the CKP is intermittent,  The CKP can set a P0300 if the CKP has a hairline crack which can occur and a labscope would be a good tool to use.  A stretch timing chain would not cause the CKP to be intermittent. If the timing chain ever was stretch you would have low power . and a running rich condition. If you had a P0300 originaly and there was no CKP code before something happens with the installation of the CKP connection. not making a proper connection , That or the CKP is not that great. and anytime you replace the CKP a CKP system variation relearn has to be perfromed.. Because the engine has 290,000 mile it be better you do not perfom it. will not set a CK ENG LT .

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