So my 1994 4.3 TBI sounds like it has a slight miss. The dealership diagnosed it as a clogged fuel filter. The miss is a lot quieter and the truck runs a ton better but the miss is still there. The engine also tries to "diesel" and keep running after being turned off. It makes a hissing noise which sounds like its coming from the right side injector. Do these symptoms sound like a leaky or bad injector?