2005dodgestratus 2.4 has cold start miss fire problem once hot lite won't comeon

HI AND TY FOR HELPING STARTED CAR NO STEAM AND COOLANT SEEMS OK NEVER HAD TO PUT ANY IN RESERVE TANK.. IDLE SEEMS ROUGH I DISCONNECTED NEG BATT TERMINAL TO RESET ...WILL TRY WHEN CAR COOOLS DOWN "CODE WAS P0304" CHANGED C02 PLUGS BUT NOT WIRES BUT DIDN'T SEE ANY ARCKING OR WHITE SPOTS ON WIRES GUESS I COULD SWITCH WIRE ANYWAY COIL SEEMS OK TOO NO WHITE ANYWHERE? THINK OF ANYTHING LET ME KNOW TY

Start engine cold, let it run for about 30 seconds, turn eng off, check # 4 plug to see if tip is wet. If so that cylinder is not burning the mixtire in that cylinder! If plug is not wet, possible vacuum leak. Good luck.

i did as u said checked plugg was dry but i noticed something else idle was ruff and idle speed changed went up then down this time engine lite didn't lite .maybe its not going to do it this time because it was coooler last nite???.i saw one tsb said check for oil in spark plugg well and its also clean ??.this seems a mystery.darn cars with all these sensors...what do i try next??? and ty