Well I have a bouncing idle now on a D15b2 with DPFI. Before I did the timing belt I didn't have this problem. When I first start the car it idles fine, but after it warms up abit after about 5-10 mins of driving I will get a cel and then I get the bouncing idle. I haven't checked to see what code it is throwing because I don't have the equipment for it. Any ideas what it might be?

 

jump the ECU and check what code its throwin, then you will definetly know. probly IACV or vac leak.