Does anybody have any idea why my truck would have a rough idle some of the
time. Its not a constant problem, its very sparatic. It will run great,
then out of the blue just start running rough. It idles fine, then the
engine races, then drops to a rough idle, then races again. It stays in
this pattern for a while, then quits and works just fine.
Why? I replaced all of the vacumn lines, no luck