Hard start and misfires...
 

Hey guys, I am really stuck here and could use some help. I have dug around on here and other forums with no luck finding my combo of trouble codes for my Boxster. It's running extremely rough and the codes I am receiving are P0344, P0300, P0306, P0304 and P0305. Thus far I have changed all spark plugs and replaced both camshaft sensors. I'm getting the correct voltage to the sensors as well. This one has me extremely perplexed...

Please advise...thanks!

I'd start by inspecting/replacing the specific coil packs (cyls 4,5,6) related to the fault codes. Then clear codes and drive.

P0304 - Cylinder 4 misfire damaging to cat converter
P0305 - Cylinder 5 misfire damaging to cat converter
P0306 - Cylinder 6 misfire damaging to cat converter

I tried that with no luck :(

take care with this one - perhaps you've lost timing on one bank. best off to a mechanic and don't start the car lest you do more damage.

Did you inspect or replace the coil packs?

I did both...

And here's the latest update, did a compression test and have no compression at all on #5...the plot thickens!

Another update...so far I have uncovered 2 busted lifters, a torn up cam, and a broken valve spring.... I've decided to stop digging and just send it off for repairs. (no time or patience for this)

Oh man, bummer. Let us know how it all turns out.