Rollin’ stock

Will those sensors go bad without throwing a code? Is there a way I can test them.

Hello, at the risk of being redundant on the forum, I drive a 98.5 24v with a 5 speed manual. About a year ago I started having a slight stutter at idle. It’s not hard, just enough to to feel and hear and it’s very erratic and only when the engine is at operating temp. At the time I was seeing some metal shavings in my fuel filter housing every time I would change it so I attributed it to the lift pump. Within the last month I changed my lift pump to a FASS 165, afterward my truck developed a hard start issue. Due to the fact my VP was original to the truck and I figured my old lift pump had warm enough to have low fuel pressure, I replaced it with a reman from Thoroughbred Diesel and the hard start went away but I still had the miss. I pulled my injectors and cleaned them, still have the miss. I replaced my injectors because they were the original Bosch and I thought the pop pressures were off. Still have the miss. I have a puff of black smoke on startup but it doesn’t smoke any other time. And it runs like a top. Plenty of power, good acceleration, and average fuel economy. At this point I’m leaning towards a sensor but I don’t have any codes either.