Originally Posted by Jerry Bransford
That the misfires didn't follow the injectors eliminates them as a possible cause so it was a good decision not to replace all the injectors as was prematurely suggested. Have you checked each cylinder's compression & looked for variances between the cylinders?
Not really. Look, I'm not saying that the problem is completely the injectors. Obviously OP needs a valve job like you suggested. I would venture a guess that the reason those valves are ate up is due to misfiring that has been taking place for some time. Doesn't sound like its the plugs, which doesn't leave much else to look at.
It is entirely possible that they are not the problem at all though. They are, however, a common weak link that if not functioning perfectly can manifest some problems like misfires. Shoot, even if you don't upgrade them at least clean them up real good so that you know they'll be flowing correctly before putting them back in and moving on to everything else under the sun. I think you just might be surprised.