I just bought a 1984 300D Turbo Diesel with 204,000 miles and it ran great on the 700+ mile drive home getting 25 MPG with lots of power. The injector return lines were leaking a little so I got the Bio hose kit from Mercedessource and installed it last weekend. I pulled all 5 injectors out (keeping them in order) to get the old lines off (they all broke when I pulled on them) and put everything back together per instructions, but minus new heat shields. I now have the following problems that were not present before. Very rough idle when cold (40 degrees) and I have to glow plug it at least 3 times to start. Lumpy idle (when warm) comes and goes). Lots of black smoke when taking off or when downshifting. Now getting 20 MPG. Just doesn’t sound and feel as smooth as it did! Can NOT replacing the heat shields when removing the injectors cause any or all of these problems? The only other work done since purchase was an oil and filter change (all vacuum lines kept in tact) and I replaced the air cleaner mounting bracket. I was just about to buy a set of rebuilt injectors with the Monark tips and start using B-100, but now I need to solve this sudden set of problems first. Any advice would be much appreciated.