93 gsx750f idle

Decided to try to resucitate my Katana. Last time I tried to start it
I came to the conclusion that the engine is toast. That was a couple
years ago.

I got it to start last weekend but the idle is all over the place. If
I set it to 1k then open the throttle a bit the idle picks up to like
3000. If I set the idle back down it dies.

The last thing I did to it before I parked it back when dirt was young
was dismantle, clean, mantle and synchronize the Mikuni's. I rode it a
couple days and it exhibited the exact same behavior then as it does
now. About the 3rd day it decided to not start so I threw in the
towel.

Based on the behavior above, is it time to try cleaning carbs again?

(Tangential Wierdness: I was getting real intermittent spark on all
plugs (only about 1 in 10 tries would any of them try to fire) so
after testing signal generator and coils I opened up the ignitor to
see if there was any obvious ugliness in there. There wasn't so I put
it back together and it decided to start deliviering regular spark.)

It has a knock in the engine at low rpms that goes away at 2.5k rpm.
The head sounds really noisy too. When I went throught the carbs I
also set valves and adjusted the cam chain tensioner.

So...Any clues on the idle moving all over the place?

Also, any tests on the engine to try and isolate ugly noises?

Im going to check compression this weekend. I couldn't hear any
knocking on the bottom end w/ a stethescope. Matter o' fact the
bottom end sounded very quiet. When the engine is cold, cranking it
will turn the oil light out. When it's hot the oil light will flicker
during cranking. I drained the oil and it didn't look bad (no flakes
or glitter) but that oil probably only has about 25 miles on it. I
have yet to pull the pan to see if there's any metal there.

Just looking for input on idle and any other general input.