Im a newbie here, want to see if I can get some help on my MAGNUM SXT.

So last week our Magnum started acting up. Some of the symptons were rough ideling like the car was out of gas. The engine lite finally came on after 2-3 days of driving like this. When I checked it with my scanner it gave me a code P0301.
Talk to friend that is a mechanic and told me to check the plugs. The plugs have never been change so decided to start there. Since code P0301 is misfiring.

Did that and switch a coil pack (301) positions. Scanned it again then it came back with P0304 where I switch the coil in also new code P0204 appeared.

OK finally got the NEW coil pack put that in. reset the scanner started her up and all 300s code disapper, but still get code P0204.
The car still shakes a little and smell gasoline like before. So Im not sure where I go from here. Code P0204 is injector control circuit. DO i have a bad injector or a circuit

HELP>>>>>>trying to avoid taking her into a shop and having my wallet held for ransom.
thanks in advance

 

Ok This is what i have done so far. I changed 2 injectors #2 and #4. But i am still getting code P0204 and P0300! What the hell am I doing wrong. The car also is still smoking up the street bad and leaking gas thru tailpipe! Which i thought was a bad injector but we still have the same problem?

Any help would be greatly appreciate.

 

A update with my magnum. After 3 weeks in Feburary with dealing with a shi**y dealership.
We ended up having to replaced the computor broad. The broad was not sending a signal to injector 4 to spark, which cause the gas to dump out the back exhaust. Replaced all injectors and coils on drivers side.
So far the car is running good. Im going to get the muffler check, notice some pin holes and not sure if that is causing any issues. We are going to put it up for sale. Last 3 months we have dump almost 3 grand into it and it justs feel time for it to go.