2005 cavalier 2.2l

My 2005 cav started acting a little wierd about 5 days ago.
It was slugish going up hill and on take off but getting up
to speed i could keep at lets say 50 until i hit a hill then it
would start to slow down ( 5 speed btw). And 2 days ago i
could hardly even get it to go. So i pulled off and let it calm
down and idle for 5 mins then it would want to pick up
speed. After about 2 or 3 mins it started to lose speed
again and start to slow down to a creep but still go. I
parked it at a publix over night figuring it would start up
and i could make it home without going 5mph and it
started and idled but a little rougher. I put it in first and still
same issue. I unplugged the intake temp sensor to see if
that was the case and still idled rough. It seems to happen
when i get to about 2k rpm. It has new plugs and coils but
not so sure on how to test injectors. Also could be a
clogged cat from a bad 02s. Idk what the problem could
be. Its not throwing a code at all. Any suggestions?