Codes p 300 is a random/ multiple misfire===causes spark plugs---HT leads ---injectors/s--ignition coil/s--low compression---wiring
codes p 301,303,305 are misfires detected for no 1,3 5 cylinders === causes listed are engine mechanical fault---wiring---ignition/fuel systems ---injectors---ECT/MAF sensors---ECM
You do not mention if this is a v6 engine in which case no 1,3 5 will be all in the one bank head
With the loud ticking noise that amounts to a mechanical fault associated with that bank
could be loose valve seat inserts , cam lobes failure or cam follower failure or hydraulic lifters problem even loose cam shaft bearings / caps
I would be inclined to remove the rocker cover and check for metal , loose bolts , excessive valve clearance before I went plugs etc
the main indicator for the answer is the loud ticking noise which indicates a valve train problem which will cause the rough running
SOURCE: LOUD TICKING NOISE IN ENGINE AFTER INTAKE REPAIR
How long have you ran the engine ? I know that they will run rough and sometimes make strange noises for a few secounds or a little bit untill everything get oiled up again. I would make sure all the push rods are back in the right place and that all the lifters are tight.
SOURCE: CAR IS RUNNING ROUGH HAS 122K. MAKES LOUD NOISE
With that many miles, I think you need to replace the timing chain or belt. Also if you havent changed the plugs, plug wires, fuel filter and had the fuel injectors cleaned lately, this might help.
SOURCE: 2006 f150 engine ticking
Change the spark plugs in it, Allso if it has a lot of miles on it allso get new spark plug wires for it,
SOURCE: 05 kia amanti, rough idle, #1,#2,#3 misfire codes
Lets see if I can educate you
There have been no tune-ups in 25 years
You only get spark plugs
Purely an advertising gimick
Most important & a reason to stay as far way from
a dealer as possible
You went to a dealer as 500 people a week on this site
alone do,only to come here having wasted your money
& nothing is resolved
You have Cylinder Misfires & codes on 3 cyl
Don't you think they were there at the dealer &
they could care less
I have been dealing with that situation for 49 years
You need a local shop that has been there with the
same owner for 20 years or more to simple properly
diagnose a fairly simple & very very common problem
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