It is so strange the at 1900 to 2000 rpm my car has a little stumble. I can accelerate through it. I have done everything I can think of and nothing. What do you all think.

 

I am currently having a very similar issue. Did you ever figure it out?

 

1. Verify fuel pressure as the vehicle stumbles, and at idle.

2. Connect a scan tool, look at the data stream as the vehicle stumbles. Verify all sensor inputs, plus the computer outputs.

3. Verify all common "tune-up" items--distributor cap, rotor, plug wires, spark plugs. Cranking compression pressure. Air filter, fuel filter, charcoal canister. Vacuum hose routing and condition, including PCV valve and plumbing. Initial ignition timing, plus the electronic advance. Does the EGR work properly? Dump a 20-oz bottle of Techron in the gas tank now, and at every oil change, to clean injectors and intake valves, and buy your gasoline at stations that advertise "Top Tier" fuel (that has added detergent to clean injectors and intake system.)

 

Turned out to be the Engine Control Module (ECM Computer) on mine. Swapped it out with a new one and the stumble went away. Best of luck!