What else is new when you buy a car with a swap already done. Car is a 91 civic hatch with a 92 B18A1 swap. I have trouble code #4. But when I try to find out where the crank sensor is located I cant find anything. When I lookup the part online nobody has it in the list of parts. What gives? It comes & goes. When I come to a stop it bogs a lil then the light pops on and when I drive down the road I cant get over 3000 rpm. When I drive down the road and shut it off then turn it back on its fine till I come to a stop and the idle comes down to a normal idle and then a bog and check engine light. The last time this happened, I disconnected the battery for about 20mins or so to clear the code and all was good for the past 3 months. Grrrr!!!!! Anyone have any suggestions? Thanx in advance.