PLTDEV OPERROR BTWN FGT AND AN ACR.

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ABOUT 30 MI S OF FAY I CLBED FGT A TO FL350 FROM FL310 AS REQUESTED ON HIS FLT PLAN. WHEN FGT A (A FLT OF 2 AV8'S) REACHED FL340 HE REQUESTED TO MAINTAIN THAT ALT. I ADVISED THE ACFT THAT I WOULD BE UNABLE DUE TO TFC AND TOLD HIM I WOULD NEED HIM LEVEL IN ABOUT 10 MI. I ASKED IF HE COULD DO THIS. FGT A ADVISED THAT HE DID NOT THINK HE COULD CLB THAT FAST. I OFFERED TO DSND THE ACFT BACK TO FL310. I THEN TURNED FGT A TO A 360 DEG HDG FOR CLB. HE STARTED CLBING TO FL350. I NEVER OBSERVED THE ACFT MAKING A TURN. FGT A LEVELED IN ABOUT 5 MI AND I SWITCHED HIM TO SECTOR 36; WHO I HAD PREVIOUSLY HANDED HIM OFF TO. PRIOR TO SWITCHING FGT A TO SECTOR 36 I DID CALL HIS TFC AT 11 O'CLOCK AND 15 MI AT FL330. SUPPLEMENTAL INFO FROM ACN 276949: AS FLT APCHED AIRLINER AT FL 330; FGT A PLT REQUESTED LOWER. TFC CALLED TO FGT A PLT INDICATED TFC IN SIGHT AND DSNDED WITHOUT CLRNC THROUGH AIRLINERS ALT (ACR B). LOSS OF SEPARATION OCCURRED AT XX04 ATC JUL/XX/94. PLTS CAVALIER ATTITUDE LACK OF KNOWLEDGE OF ASSIGNABLE ALTS IN PCA; LACK OF KNOWLEDGE OF ACFT'S PERFORMANCE. AT NO TIME DID THE PLT INDICATE THAT HE HAD A MALFUNCTION. ONLY THAT HE HAD GOTTEN SLOW.