[問題] 怠速時引擎轉速往下掉
自己的車是GP2,
之前換了一次空濾後就常常出現停紅綠燈時怠速，
轉速就會掉到一千左右，催一下油門才會爬回去，
或者騎高速(70-90km/hr)一段時間油門放掉之後轉速會一路掉到熄火，
想請問這樣正常嗎?
(雖然不影響騎乘，但是就有一點困擾)
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