85 ford bronco ac comp/clutch issue

I replaced the ac comp on my 85 Bronco, when I did I also replaced the accum., orifice tube, inline filter and orings. Before instlling the replacment parts I flushed the system with a liquid flush and used an air compressor to remove solvant. I attached all the fittings and started recharging the system. After 12oz (1 can) of 134a the cluth started to kick in and remain steady. After about 10 min of the clutch running it started to slip and screech also saw a tiny sparc. The system guage said the pressure was correct. any ideas (a friend said that he thought that the clutch needed schimed/adjusted.) This is a 85 full size srait 6 4.9l, 4speed, 150,000+ miles and the comp is a 4 seasons 57112 fs6. I did add oil to the compressor pag 46 6oz per the document that came with the comp. PLEASE HELP>>>