I am working on a friends swapped delslow.Someone else did the swap and had issues there after.I got swindled into working on it now.The problem is it fuel fouls the plugs and idles rich.It has a gsr swap that was a sohc w/ auto org. What I have already done:
1) Rewired ecm for the swap
2)Checked timing marks
3)Replaced plugs and 02
4)Dist (because it lost spark)
5)Swapped ect,map,tps with known good sensors.
6)Checked fuel pressure ok

Any help would greatly be appreciated.THANKS