150psi of compression on all cylinders.was a 305 motor swapped in a 350 and used the stock 305 roller cam setup,heads,intake and tb.added headers and h-pipe to match with no cat.idles at 1500k and wont go any lower.misfires on cylinder 4,7 and 8..has plenty of power but can tell it miss fires when hitting the gas hard and at idle the air going into the tb is loud.sounds like a vacuume line disconected but there isnt...
anyone have any ideas for me?

 

read codes and they are tps voltage low and coolant sensor low.them have any thing to do with it?