Loss of POWER

Need a little help....
Is it possible to lose a lot of power if your timing is a little off? My harmonic balancer went bad and separated from the rubber over a period of time. this caused part of the balancer to rub against the timing cover. I replaced the harmonic balancer(which was a pain in the a**) and i patched up the timing cover. It had a small slice in it. Now I have everything put together and I still dont have the power I used to have. I also checked the FI and I did a tune up. So now Im thinking the timing chain may have jumped....does this sound like the possible prob?? Can something else contribute to this loss of power??

[Moonunit 451]

How many miles on your car? Could your cat be pluged? Check compression. Oil consumption?

my car only has 57k original in it. I did a engine diaognostic on it, but they couldnt go any further with out fixing the harmonic balancer first. I going to be puting a new timing chain and cover on it... I just wanted to know if there was anything else to look for...