If you bumped the timing, you NEED to reset the computer. By adding those 4 degrees, you just threw the computer for a loop! It will fuck up all timing tables that it has "learned" over the time that you've been driving it. And again....Did you pull the spout connect out before you did all this? With the spout pulled, timing is LOCKED....put it back in and the computer has control. The computer will usually bump timing at idle from what YOU set it at. You can watch this yourself. with the car running check the timing with the spout out....stick it back in and it goes up a few degrees. Try reseting the computer. If that doesn't work, we can probe further.