jpeacock86

Ok I searched alot and have found similar threads but not a problem like mine.
I have a 1996 ek sedan with an f22b2 with 5 speed trans. The car had an h22a4 but spun a rod so I opted for a motor and tranny I had lying around. Anyways the car runs fine the problem I'm having is when I take off and get to around 1500 my car starts jerking really really hard like it's going to rip my mounts loose. It continues to jerk until I get over 2,000 but if I push the throttle hard it'll not do it because it gets through the 1500-2000 range fast enough that it doesn't have time to start jerking. But trying to cruise at about 30 in third gear just sucks it does it in every gear between 1500 and 2000. I've tried running different ecus, replaced tb twice thinking it was the tps but no luck there. Any suggestions are greatly appreciated. I'm lost as to what it is because it also did it with the h22 and now still persist with f22b2. Please help
Car also does it when cold or warm or driven for one mile or 50 it doest get anybetter. Don't say it's because I don't know how to drive a standard haha. I'm an avid swap enthusiast but this is the first time I've run into this problem. Only cel I'm throwing is for the o2 sensor but I've always had these codes in my cars and have never had this problem.