i swapped my obd1 b16 manifold out for and obd2 type r unit about a month back. when installing everything i noticed that the obd1 iac valve bolt holes didnt line up on the back of the manifold. luckily my brother had an obd2 unit at the house. so i bolted that on instead. ever since then i havent been able to get my idle under 1500 rpm. now my question is: could the obd2 iac valve be causing all this trouble, or am i overlooking something?