I bought this car about two months ago, Fixed an exhaust leak before the cat on the drivers side, drove it about seven days and the water pump housing sheered off. After installing that and a lightened AMS main/water pulley, she bogged down and would not idle. I have since put new PCV lines on and fixed a vac leak. She Usually idles, but now its high 1500-2000 but it still will randomly bog down and die out in neutral.
1) have not pressure checked the fuel yet
2) the vibration is directly linked to accel, but even in neutral at speed it has vibration (not tires/alignment), should I be planning to 1 pc driveshaft it?
3) I just installed different USED injectors that checked out in the OHM test
4) Have not done a compression check yet

Is there anything basic that I should be looking for, I see this problem posted up a lot. I will get the fuel pressure tested tomorrow if all goes well