I need some advice/ help with my cars terribly weird jerking!

My 92 stealth es is acting up! Under certain circumstances the engine will feel like it's "dropping" as if is was cutting out, however it doesn't and just revs back up. this all happens in like 1-2 second increments. It happens when pushing the gas pedal past a certain point and in the mid range to high rpms. It doesn't go away unless I turn the car off. Then back on but eventually it always comes back. I can only relate it feeling like going reaaally slow in a high gear sorta a back and forth jerk. help....

The obvious first place to check is the caps in the ECU.

How old are the plugs and wires? They could also cause what you are experiencing.

I replaced the tps, plugs, wires, coil packs, and fuel filter within a month.

How hard is the ECU to get at?

It's very easy.

Stealth 316 - ECM Removal

Now do you think this is what lies as the cause? Could a vacuum leak cause the issue I'm describing? There is a hiss when the car is turned off, and when reving the car using the throttle shaft I hear a hiss seemingly come from it

First gens are notorious for ECU cap leaking and can very well cause the issues you are having.

A hiss with the car off would not be a vacuum leak as there should be no vacuum with it not running. Even if there is a small vacuum leak at the TB it wouldn't cause the severe hesitation you are describing.

Any mods? I've seen a TT do something similar with a bad MAF.

Add cam/crank sensor to the list of reasons. I've had that happen 3 hours from home.

The only mod I have is a hps air intake system with a k&n filter, I bought a remanufactured MAF but it made it idle bad compared to the old one, so I'm sticking with the original. It may have an EGR delete but I'm not too sure what to look for. Also for the Cam sensor, is that interchangable between all years? I did notice a price difference for my gen, I'd rather not spend an extra 40$ I'm also seeing something off of stealth316 called the CAS is that the cam sensor you speak of?

Are the cam/crank sensor the same thing cause I'm seeing multiple things for that name, one is silver and costs 230$ the other is black with a wire and costs 60-90$

Yes CAS is cam and/or crank sensor. Your CAS is the silver one on your rear head. That style was used on 91 and 92. 93+ went to a separate cam and crank sensor and they are the small black ones with a wire.

It is highly unlikely your car had a EGR. Very, very few first gen NA's had an EGR from the factory. If it did and was deleted you can look at the back of the intake manifold. Look closer to the throttle body side and there would be a small metal plate that would be bolted to a flat area. If there is no flat area, and no plate, then your car never had EGR.

Start with the cheapest diagnosis first. It doesn't cost anything to look at the ECU. If you open it up and it is clean, then you can move on from there.

Check that the idle set screw is actually IN the throttle body. My car ran super funky when that mysteriously disappeared.

Problem fixed! Injectors were terrible and the fuel rail was plugged, knew it once I put 91 octane in. Cleared it a up a bit. The root of the problem however was my gast tank, which when I took off had so much rust in it you could reach in an grab a handful, know wonder my gas gauge always read more than it should lol