vetmanuk

Hello, i am looking for a cheap used PSM for my SS Camaro 6 speed manual cos it looks like i have a circuit problem. Code P0353 missfire, i have had wiring,coil,plug,lead etc all checked & changed & still no spark at the plug so electrician has traced it back to the PCM, we have no wiring daigrams for inside PCM so he is going to check for dry joints & re-solder, in the mean time he suggests trying to track another one then we can get it re-programmed with my settings wirth a tech 11.
I have found one here in the UK but its for an auto & know they are different.
Can anyone help???