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Re: ticking under valve cap
You have hydraulic lifters, and they need oil pressure to pump them up. Once sufficient oil pressure builds up (which should only take a couple seconds), the ticking goes away. You might help to alleviate some of the problem by getting a product called Seafoam. Pour half a bottle into the oil, drive for 30-40 miles (no more than that, as it does thin your oil out), and then change the oil and filter. Seafoam can clean crud and sludge out. Some of it may be blocking the oil channels to the lifters, and the Seafoam can clean it out and allow them to pump up more quickly.
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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
If there was a problem that caused the rocked to become dislodged I would have checked the rocker bushes and shaft and replace both. The rocker where it works on the end of the valve wears a recess that will move and then click back into place. I would use a 20w-50 grade oil and additives work at reducing friction . IF you need it to thicken the oil then there is something worn out.
pull your valve covers and look at you rocker arms see that none are lose if there isn't any lose then you may have a bad lifter witch once you pull your valve covers you will see rods on the far side of the rocker arms, at the bottom of every rod there is a lifter witch rides on the cam shaft. to fix this you have to tear down the top or the whole motor, good luck