The compressor was new and I poured all the oil out of it. Was only about 2 oz in it. I poured in some new oil and hand rotated the compressor and poured the oil out. Did the same procedure a second time.
After I poured the oil out, in put 7 oz new Ester Oil in and capped compressor. After I got the compressor installed and all hoses attached, I again rotated compressor 10 revolutions and it felt fine.
I think your first suggestion may be true. There could be some trash partially blocking Orifice tube.
I am going to recover the 134a and check the Orifice.
I think the compressor is knocking when the low side pressure drops because of High head pressure. The 134a is stuck between the orifice tube and the compressor. My high side guage could be giving a bad pressure reading. I am going to check it with a different set of gauges.
Thanks for all the help.
If you think of anything else, let me know.