Update:
I decided to just take my car to a person I know locally that works on cars. I wanted to see exactly what the computer was reading on my car. He said the "service engine soon" light was triggered supposedly by the EGR valve/sender unit, also it read saying the car was running too cold too long, so he suggested changing the thermostat. I did just that, I noticed starting it in the morning it seems to start better, doesnt make that terrible "tick" sound so loudly. Whenever I pulled the old thermostat out, it had broken on the side, I'm sure that consists of part of the reason it was running bad. The last thing it read was the the gasoline sending unit was bad ( It makes sense considering the car was hit in the rear corner a few years back. It is something I'm not concerned about. Otherwise, I still don't know what explains the loss of acceleration in 5th gear. I've gotten new spark plugs & wires, air filter, thermostat, oil change. It had helped it quite tremendessly from whenever I first bought it, but could it be fuel related? Maybe a fuel filter? I'm guessing everything on the car is original, the thermostat actually had the Chrysler symbol on it, which tells me it's original or was taken to the manufacturer, I really don't know anything about this car. I'll probably be taking it in within the next couple weeks to have the EGR valve replaced (It needs to pass IM by the end of June) eeks, I was also told it has an exhaust leak.