Vehicle : 1997 Honda Civic LX, Manual

I was driving on the highway and notice the vehicle started to misfire or what feels like that. When I am starting to move from 1st gear I have to get the rpms up to around 3500 RPM to get the car to move off smoothly. It misfires at all gears except when on the highway in 5 th gear cruising above 55 MPH.

What I have done so far.

While the car is idling I pulled each spark plug wire separately and noticed the engine idle changes to a very rough state. So each spark plug is firing. I got 1 new spark plug and a new set of wires. I replaced each cylinder with the same new wire and spark plug. As in I did not replace them all. I just use the same new plug and new wire in each cylinder to see if it runs any differently for each cylinder with a new wire and plug while leaving all the others old parts. Nothing has changed.I then remove the throttle body and removed the MAS sensor, and the idle air control valve. I cleaned out all the carbon build up and checked the idle air control valve with a 9V battery it does operate the passage by closing and opening it.
I removed the fuel rail and turn the car on the see if there was fuel being pushed out of the fuel injectors and fuel is exiting all four. I did not check the fuel pressure since I do not have a fuel pressure tool. I checked the OHM on each fuel injector and receive 12.5 OHM on each 4.

I removed the distributor and the rotor and cap look fine. I do confess I could use a little image on what is bad or good each part. There if not oil leak into the distributor.

I am a little stuck and could use some guidance. I have a check engine light on that is for the failing speed sensor p0500 or something like that and this is not related to the erratic bucking, none smooth acceleration. The speed sensor does function and the failure is with the display gauge.

Thanks
] EDIT [
I cleaned out the area where each fuel injectors sits as they were carboned up. There was no oil leak in the chamber of each spark plug.
I did a vacuum leak test by spraying brake parts cleaner and found no change in the idle rpms so no leaks.

 

] SOLVED SOLUTION [
Today I finally received the following check engine code P0108 "Manifold Absolute Pressure" senor had failed. All is fine after installing the new sensor along with clearing the code. If this code had triggered before this would have saved me time and money. Hope this helps.

Thanks