I just recently did a mpfi swap on my 90 std hatch (w/stock engine)i am still having two problems. 1st one is if i use any other ecu besides a pm8 i get a code 4 which i have reserched is a CPS problem. I tried using a pm6,pg7,& a pr4 all obdo. I dont get this problem at all if i use the pm8 ecu. I dont understand why the pm6 doesnt work at all. I have had the pr4 working once for a couple of days and it stoped. The things i have done to pinpoint this problem are- I have checked wiring over and over found no problems and used and tested two different correct distributors. I have also purposely wired the 2 CPS wires icorrectly to see if the pm8 ecu picks it up and it does. So it is not a faulty ecu. I have also swaped the pin location of the 2 CPS wires and it still doesnt work. 2nd problem is sometimes my pm8 ecu throws a # 15 code which i have researched is a ignition output signal. There is not a certain time it does this which is weired. It will do it a cold start, while i have been driving, sometimes it wil take 5-10 days before it acts up. Things i have done to pinpoint this problem are- I have used 2 different correct distributors and have checked my wiring over and over and i find nothing. I am going to swap a single cam vtec into my car soon and would like these two problems to go away. Any help would be nice. if there is someone local in fort worth that could help me that would be nice. The only thing i can think of doing is to redo the mpfi swap using a different dx harness or taking it to a local shop.