Van reading off multiple codes ?

Question

I have a 03 dodge grand caravan sport 3.8l. I recently had all my spark plugs, the wires, the coil, the valve gaskets, and a full exhaust system replaced on it. And it still runs horrible, has a gas smell when started and a blinking check engine light. The codes reading off are p1684 p0300 p0455 and p0305 please help.

Answer 1

P1684 Battery was disconnected

P0300 Random misfire

P0455 EVAP system large leak

P0305 Misfire number 5 cylinder

What you have is a misfire condition , when ever the CK ENG LT flashes that a misfire condition, Since the coil and sparkplug where recently done , you would have to rule out if the fuel injector is faulty, and rule out a mechanical condition by doing a compression test on cylinder 5