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I have this 2002 blazer LS 4wheel drive with a 4.3lt motor. All of a sudden the motor begins to hesitate misfiring with no engine light at all coming on.
I took it and had it scanned and the codes were

PO 135 o2 heater
po300 misfire engine
PO 327 knock sensor
signal short/low

No engine lite. Would I be heading in the right direction checking the distributor cap first or? Anyone help me out here please

Mark
 
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