Hi Guys

Ive picked up a 1998 Tiffany Mobile home with a 454 Injected Engine

I was told someone put water in the Fuel Tank, tank has been drained and flushed, 3 inline water separators have been installed ,injectors have been stripped and re kitted, new plugs and leads have been installed
Have had the injector manifold off and checked for damage, appears ok, resealed manifold has fuel pressure etc the issue is the engine is now only running on 4 cylinders

Any ideas please urgent

Cheers

Jeff