Dohc swaped

[Dsmmodified]

I just picked up my first 240, and the previous owner did a quick swap from Sohc to Dohc 5spd(1991).I noticed that the Breather is not connected, and the line for the FPR was not connected, and the car ran like crap.I fixed those 2 problems, and found another. An exhaust leak at the downpipe (which i have not fixed yet.)My new problem is when i drive the car after coming to a stop the idle rpm get crazy. Sometimes it holds at 700 other times it wants to stall out, but the ecu picks up timing and stumbles again, eventually stalling if i dont give it gas. Ive been doing alot of research on the swap just to gain more information, and found that my connector for my IACV is broken and all emissions are removed, and welded shut or blocked off.(possible cause of the idle problem) Looking at the downpipe he welded it making the downpipe and test pipe together. (I dont remember seeing an O2 sensor here) Upon further investigation, and trying to reset timing and everything else in the book for idle, i decided to look at the ECU. Serial # A11-B47-G73, over at Jim Wolf this is a Automatic Ecu. Could this also be the cause of the strangely Rich rough idle with black smoke and miss-fire's??Drive fine most of the time, sometimes if feels like its getting to much fuel and bogging out if i give it more then half throttle. anyone else having this problem or something like it before?Any ideas would be good.Sry for the long written first post.

[Dsmmodified]

Anyone having this same problem??

[gumby74]

I did my own swap (KAE to KADE) myself after a complete rebuild including higher compression pistons and .20 bore. I have no issues what-so-ever outside of a slightly higher idle, about 900 at times, and dissapearing oil. Which after much scrutinizing was caused by a badly sealed oil pan gasket. Which I have been trying to convince myself to replace for the past 2 weeks.

I also have the emmissions system deleted including the air injection valve and all but 1 foot worth of vacuum tubing on the whole engine.

[Dsmmodified]

i think its my iacv thats giving me problems. Ive changed everything (plugs,wires, rest timing, and fuel pump) next up Fuel Pressure regulator, then IACV. when i changed the fuel pump i did notice it wasnt running as rough. But it still has the hunting idle and and stalls. so its prob the iacv.