2000 Camara v6 5spd losing power and rough idle

I dont know jack about cars, thats why Im here. Just looking for possible diagnosis so I dont get effed when I take it to get fixed and they say they replaced the flux capacitor and it costs me 1500 bucks. Anyway here is some car history. Daily driver 76,000 miles oil change regularly. The ignition has been replaced once. Air filter replaced a couple times. Body damage from hitting a deer in March 05. Right after that is when it started losing power. It didnt happen very often in the beginning maybe once or twice a week. I would start the car and it would idle for a few min and every few seconds it would seem like it was missing a spark or something. When I would drive it it would kinda chug when getting going but after it had warmed up it would be fine. Fast Forward to now and it would continue to get worse and more frequent from March to Nov. I havent done anything to get it looked at cause there are still days when it drives just fine or after it has reached temperature and shutoff then started again later it doesnt do it. Now though it does it constantly doesnt matter if the engine temp is hot or cold, starting in first gear or running in fifth gear. It does seem to not do it when Im just cruising along on a flat road and dont need to accelerate. But when I get to a hill or need to pass and push on the accelerator it spudders chokes and shudders. Hopefully its not a death rattle. I thought maybe an injector was clogged/dirty so I put some fuel injector cleaner in the tank. Didnt help. The check engine light never comes on and the light does work. When it shakes and chokes it does gain power but its so bad that I let off the gas and it stops but I cant maintain speed when I do this. Any questions or suggestions let me know.