Yeah mk1 focus, the rs throttle body is surprising similar to an escort throttle body though, as they share the same tps. With the tps disconnected it runs as bad if not worse but I've adjusted the throttle idle position using the adjustable pin thing, now it starts and runs for 5-10 seconds, then cuts out.
I had an issue at 1st on my standard tb as I'm running heavy cams, but I haven't got the induction pipe properly on yet as I don't have the correct size pipe, but could it be its drowning in air after it starts to idle without the pipe correctly on? If that makes sense..