A C150 ABORTED TKOF TWICE DUE TO LOSS OF PWR. FOUND CARB CTL ARM LOOSE. LOCK NUT BACKED OFF DUE TO LOSS OF COTTER PIN.

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I WAS TAKING OFF FROM ZZZ WHEN I EXPERIENCED A LOSS OF PWR. I TOLD THE TWR THAT I WAS ABORTING TKOF AND CANCELED MY CLRNC AND TAXIED TO PARKING. I COULD NOT DETERMINE THE CAUSE BUT IN A FURTHER RUN-UP; THE ENG MADE FULL PWR SO I ASSUMED THE PROB WAS POSSIBLY TOO LEAN A MIXTURE AND SO CALLED FOR ANOTHER CLRNC. AS I WAS TAXIING OUT; I THOUGHT THAT I HAD HIT A CHOCK WITH MY NOSEWHEEL BUT IT WAS LATER DETERMINED THAT THE LINE MEN HAD LEFT IT STANDING ON ITS END INSTEAD OF LAYING FLAT AND THE TIP OF MY PROP HAD HIT IT. SINCE I DID NOT HAVE REASON TO BELIEVE THE NOSE GEAR WAS DAMAGED; I ATTEMPTED ANOTHER TKOF AND AGAIN EXPERIENCED A PWR LOSS AND SO TAXIED BACK AND HAD A MECH LOOK AT IT AND IT WAS DETERMINED THAT A COTTER KEY HAD SOMEHOW COME OUT OF THE NUT HOLDING THE CARB ARM AND IT CAME LOOSE ENOUGH TO CAUSE INTERMITTENT SLIPPING WHEN THE THROTTLE WAS PUSHED TO THE FULL ON POS. THE MECH REPAIRED THE PROB USING CESSNA'S PROCS AND I FLEW BACK HOME. THAT NIGHT I GOT A CALL FROM AN FAA INSPECTOR AND I TOLD HIM THE STORY AND HE SAID THAT WE HAVE A MAINT ISSUE AND THAT HE WOULD BE CALLING ME THE FOLLOWING WK. SUPPLEMENTAL INFO FROM ACN 654408: THE LAST ANNUAL INSPECTION WAS COMPLETED TWO WEEKS AGO. THE ENG CTLS WERE CHECKED AND INSPECTED AT THAT TIME.