Hi everyone, I removed the injectors from my Z and noticed a dark red colored sticky deposit of fuel residue in the bores of the lower intake. I removed it with carb cleaner no problem. Any of you come across that? I had issues with intermittent starting and fuel injectors leaks before. The fuel pressure would not hold and dropped right away, there were no external fuel leaks and the pump check valve was holding. After using an injector cleaner the engine would run fine and the fuel pressure was holding around 38psi. However, after a month or so the problem come back again. The engine seemed to run out of fuel randomly, so another dose of fuel injector treatment and all was good again. Anyway, I am replacing the injectors with the later type at the moment. I was using Puma or Shell V power, but changed to BP ulimate now. As this problem was defenitely fuel related I just wonder if the various fuel addadives can cause the sticky build up? BTW the tank is clean, engine compression is 165 on all cylinders. Engine done 15k after stock rebuild. Anybody come across this before? Oil is Penrite 5W/40 Any thoughts?