A lifter "tick" would NOT get noisier with an increase in load. 99% chance you can rule out the lifters.
Start by checking the timing (with a light), following the specified procedure, and also take a look at the 'puter with a scan tool, looking for codes pertaining the ESC (Electronic Spark Control).
If the knock sensor is defective or disconnected, the ESC won't be able to sense any spark knock, and the 'puter won't know to retard the timing as needed.
Sometimes, guys will pull the plug on the knock sensor on a worn engine, to keep the 'puter from "hearing" noise from a loose timing chain or piston slap, ind interpreting it as "spark knock", and therefore, retarding the timing.
Another thing that will cause detonation under load on these engines is a plugged or otherwise non-fuctional EGR system.
Unless you can determine it IS something simple like an exhaust leak, I guess the best advice would be to have a mechanic look at it, as continuing to drive it with it knocking will destroy the engine, if it's not too late already.
Another note... it the "check Engine Light" coming on, indicating trouble code(s) have been set? Does the check engine light come on when you turn the key towards "start", or has someone removed the bulb?
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