I have a 1994 Toyota Pickup
2WD with a 22re...
So I have a semi new rebuilt engine that I dropped in there last year. I have noticed that there is a slight, but very noticeable jump when the engine idles and when I am driving it.
I have adjusted the valves, replaced the PCV valve and the grommet, set the timing to 5°, and set the idle to 750 rpm and still has that jump/misfire.
So what could cause this jump that I am I think is a misfire?
* New fuel injectors
* New distributor cap and rotor
* New spark plug wires and plugs

Only thing that comes to mind is a vacuum leak somewhere

 

Inspect your camshaft I bet you have a flat lobe or two. Whose cam did you use in the build?

 

Check engine grounds as well. There is a really good writeup here:

https://www.yotatech.com/forums/f116...-guide-194413/

I found a few of my grounds to be totally missing, as well as some of them corroded / dirty. I even added a few more grounds just to be safe. Car starts up with a single crank every time, and engine stutter was greatly reduced. Since you did remove the engine, chances are maybe one of the grounds is not up to speed, or maybe a connection point on the block you dropped in was dirty.

It could also be a dirty alternator connector, it sits in a harsh spot prone to corrosion. Pull the connector off of the back of the alternator, give it a good blast with electrical cleaner, and put a very thin layer of dielectric grease on the connector connections before throwing it back on.

Good luck! Hope you get to the bottom of that!