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Check condition of the plugs, could also be coil pack(s) going out, if ignition looks good check compression all cylinders
The timing is off. it will need to be hooked up to a hand held computer system at a shop to correct this.
Trouble code P0306 means:Cylinder 6 misfire detected
start with checking the coil packs wires sparkplugs
P0300 is a random cylinder misfire. Ensure engine is properly tuned.
I had that happen n I changed my plugs n coil pack...easy to do
Start with a bad Spark Wire Followd by a new Distributor Cap and Rotor button. Pening that failure, replace the sparks.
Several things can cause your 1996 4.3 liter V-6 engine to misfire and have a vibration. A bad fuel injector is the most common cause.
Try checking your engine mounts and bolts. On my Engine was it a misfire condition,the sparkplugwire from cyl #6 came loose I have a 96 Camaro RS 3.8 L.The other time it was a small Vac Line by the Throttle body,that caused a bad shake
A lot depends on when it is sputtering. Is it hesitating under acceleration? That is what happens most commonly in eclipses. It is probably a misfire in one of the cylinders. Change your plugs and wires.
Misfire can be caused by many different types of problems with your valves. It could be burned or leaking valves, carbon build up on the valves, weak or broken valve springs, worn valve guides or lifters, broken worn or bent rocker arms or pushrods, worn camshafts, improper valve timing, or worn pistons or rings. A misfire is basically when the cylinder is not producing enough air-fuel mixture properly, so your valves may not be supplying the proper amount of air into the cylinder, for the compression to be strong enough for combustion.
It could be out of time. It could be connected to the wrong plug in on the distributor. Check your wires for breaks in them.