Why does my jeep accelerate all the way when starting it up?

SOURCE: Valve knocks when running reaches 1500 rpm

First, nothing you have done has anything to do with valve tappet noise. What is your oil pressure? Have you positively identified the noise as a lifter (tappet), OR COULD IT BE AN ENGINE BERARING OR WRISTPIN? Other than tearing it down and replacing lifters, rockers or pushrods or possibly even the cam, if oil pressure is good, change the oil and put a quart of Marvel oil in there. If that does not clear it up in a few days, you will have to go inside the engine. You likely have over 160k on that engine...consider using a replacement. Get an older tech to listen to it...it takes years to be able to differentiate between different component noises with any accuracy.
Personally, without hearing it myself, I'm betting it's a rod knock.

SOURCE: sounds like air escaping under the manifold

Sounds like a normal issue for this engine as long as the noise goes away after a short period. It is the idle air control valve working correctly.

SOURCE: jeep starts and idles perfect no acceleration,

Sounds like the catalytic converter or muffler are clogged. There isn't much exhaust at idle, but when you accelerate your exhaust volume increases, thus if your catalytic converter or muffler are clogged the restrict the exhaust escaping out thus causing an excess of back pressure which won't allow the engine to breathe normally.

SOURCE: Have no power on acceleration, backfires 4.0L Jeep

could it be your throttle sensor? If it is a carbureted engine, check the accelerator pump inside the carb.

SOURCE: 2004 grand cherokee , can a bad throttle

yes a faulty tps chould do that also maf sensor are any fault codes showing up?