Chain skipping on new single speed freewheeel I just got a Colnago Master Arabesque single speed conversion from a friend who moved abroad.

It's set up as a fixie on a flip flop Hub. I flipped the wheel and installed a new single speed 1/8 freewheel, loaded up the chain but it's skipping under pressure,
wondering if anyone had any ideas why along with the below?


New chain? - will be getting a new 1/8 chain today 
Misalignment, I noticed he'd probably bodged a cold set to get it to single speed, may be that the freewheel is out of alignment with the crank? - But then the fixie set up he had works fine when I flip it back.


Does anyone have any other suggestions as to why it skips so badly under even a little pressure?
One two options given that your freewheel is new:


The chain is too loose. A chain tensioner might help. Alternatively, if you have semi horizontal dropouts just pull the rear wheel back and tighten.
The front chainring is worn. This has happened to me before. Replacing the chainring solved the problem.