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it will go away then come back outta nowhere one day randomly in the future while your on the freeway 40 miles from home and scare the crap out of you. it just pops up whenever something else goes wrong i swear.
AEM cold air intake.
MPX 60 mm TB
Possible causes for throwing the P1684:[*]BATTERY WAS DISCONNECTED[*]PCM WAS REPLACED OR DISCONNECTED[*]QUICK LEARN WAS PERFORMED[*]FUSED B+ CIRCUIT TO TCM OPEN[*]GROUND CIRCUIT OPEN[*]INTERMITTENT WIRING AND CONNECTORS
Either way the code has to do with the computer and output circuits...