The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors
caused by slight tolerance variations in the crankshaft, and the CKP
sensors. The calculated error allows the powertrain control module (PCM) to accurately compensate for reference period variations. This
enhances the ability of the PCM to detect misfire events over a wider
range of engine speed and load.
My 1998 blazer with a 4.3 stalls at times while sitting yet idles smooth. It occasionally misfires...
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My 1998 blazer with a 4.3 stalls at times while sitting yet idles smooth. It occasionally misfires at high speed (freeway) A week ago I noticed the lights flutter, could it be related?