My truck has been shaking a bit at idle. With the hood open it doesn’t look like the engine moves much but I can feel it in the cab. Going up a little from the 750rpm it is set at for warm idle eliminates the shake. It’s smooth when driving regardless of engine or road speed. The little bit of reading I’ve done suggests injectors may be to blame. I have no idea the age or condition of the injectors currently installed, is there a way to test them to see if they’re really bad before replacing them? There’s a shop in town nearby that claims to be familiar with older stuff. He has been doing his thing for 40 years or so. He said he could rebuild them but can get new ones cheaper. But I’ve read some horror stories about the new ones available today. The truck is a 1994 7.3 NA with 285,000 miles. 280k when I got it. Just buying injectors feels like throwing parts at a problem without really diagnosing it.