97 Pontiac Sunfire, missing power, stalling and idleing rough?

[asdfds]

My pontiac sunfire will barley take off and will max out at 65 km/h going up hill (40mph) and it will stall from time to time. I was told it could be the fuel injector o-rings. would that be the problem? if not what else could it be, PLEASE HELP!!

 

[gmtechs]

what engine

there is an update program for stalling did u have that
if u r ownly get to 65km/h u could have a miss cylinders not working or coil pack dead
bad wire
bad spark plugs

ok what we need to know

what engine

sitting at idle is it running rough (missing)

coolant bottle full

do u see smoke( black , white, blue or none)

do u smell fuel

any noise when engine running (rattle type)