My '83 240 Turbo suddenly developed a low-speed engine miss. It is not a steady miss, which would indicate an ignition problem or, worst case, a burned valve, but rather the miss is erratic. It goes away above 2,000 rpm or so. So far, I've had the fuel filter replaced and I added a bottle of Techron to the gas tank on a recent fill up. Both of these seemed to help somewhat, but the problem still exists. Next, I'm thinking that I should go ahead and pull the injectors and inspect them for crud buildup, and clean them as necessary.

So, I'm wondering what the most likely possibilities are that would lead to this condition, and is there perhaps anything else I should be looking for?

Best,

Michael