My engine (see title) knocks pretty loudly when I try to accelerate while at a low power setting such as one encounters when cruising at constant speed. The truck is stock. I received a recall notice when the truck was pretty new. I took it to a dealer and they "reprogrammed" the PCM. Not sure if this would affect knocking at all. Another thread recommended replacing the timing belt tensioner, suggesting it may be the lifters that are knocking. Has anyone else had this specific problem? If so, how was it solved? Thanks in advance!