help my car misses unless under a load

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codes are 511,114,573,571,583,556
and cylinder balance test. 5-3-8
it has a mail order chip that was set-up with the old X-cam....but, when i first installed the 1087 cam it ran fine no drivability issues.
 
u have the T5 listed in your sig and my buddies car used to do that after a tranny swap...he replaced the ecu with the same exact one (matching part numbers) and it stopped - no idea why but it helped

this probably doesnt help any but...
 
Well right before i blew third gear out it had a slight miss.....so that night i changed the oil and cleaned the MAF. On my test run i tore the tranny out.....well i put a new one in and the miss has gotten worse, but it stops missing when it is under a load.....On saturday night i will unhook the O2 sensors and see what happens if nothing changes then i will take the chip out and go from there.
 
i'd get under the car make sure you plugged everything up correctly under the car when you were doing the tranny (especially the 02's)
if not id really look into the wires and plugs (my car used to foul plugs and miss because i had oil rushing down into the combustion chamber due to a bad pcv valve)