Clear injector return lines size ?

[DA BIG ONE]

I've been going bonkers and thinking now one or 2 of my injectors are leaking down, just not working right. Get a miss when cold for about 10 seconds and every once and awhile on the road when warmed up a slight miss/stumble comes then goes away.

Thinking, clear return line hose will make it easy to see which one are giving me trouble and need to know what size the hose is and where to get some at?

[More Power]

The injector fuel return hoses are 1/8" ID. Dr Lee used urethane tubing, which is a slightly amber, but clear enough to see bubbles. I don't remember where he bought it.

Jim