Hi guys, new to the forum.
I bought a pretty tidy mk3 golf cl, 3dr. L reg and i got it home with just 68k on the clock, unfortunately its only a 1.4 though

Now it didnt come with a head unit so i went a bought one(sony, can find out the exact model if required), as i'd read on another thread i bridged the ign feed to the perm feed and plugged it straight in to the loom.
The problem is it doesnt always turn on with the electrics on or the engine on, its very temperamental. sometimes it powers with the ignition, sometimes it does after starting the car two or three times, sometimes not at all. It also sometimes cuts out when i turn round a corner but comes back on a few seconds after.
My first thought is would it maybe be the ignition switch needs replacing?
Any ideas?