1998 sts wont start unless u hit the gas then it runs rough ..u put it in drive it wont run over 2000 rpms then it dies

Have you checked the fuel pump for any blockage? The car isnt getting any gas unless u manually pump it by pressing the pedal.. So start there
Sometimes when a engine requires excessive revving and throttle to stay afloat its a fuel supply problem. A clogged filter for example can be overcome with excessive throttle that drives the fuel pressure up enough to force it through, but it will barely trickle at idle and stall.

Usually the dead give away for fuel pump is when someone complains they have to floor it as soon as it turns over or it will die right away.

You better check the plug wire installation, I think you got it wrong.

might be the idle air control valve, without it functioning the engine wont be getting air into the cylinders and not run unless the gas pedal is depressed

With the car running rough it could cause the harsh shift but if it is staying at 5000 rpms then the ****** is about to go out on you. The rough idle sounds like a vacuum leak. If you can keep the car running at idle listen for a sucking type sound. That would indicate where the vacuum leak is.

run the fault codes
indicates an injector problem
dirty injectors, low fuel pressure , wiring are all possible issues

Get the codes that were saved when the "engine light" came on and post them here. (You can get them retrieved for free from Auto Zone).

I'm going to take real *wild* guess that somehow that rough spot you hit actually impacted the oxygen sensor and disconnected it or damaged it.

Hi Lots to look at to trace this problem. Make sure that the belts are tight.

Did you change the fuel filter?

simple , new fuel pump!!!

The tps(throttle position sensor )may be malfunctioning