You are correct in that the Nippondenso distributor was used in the 86 XT MPFI. There is a long list of electrical issues with my GL10, that can keep it from running properly and sends them to the junk yard. They are A. coil goes bad B. the hot wire coming off the back of the alternator gets hard, and eventually breaks but makes the engine run poorly in the process before it breaks. C. the engine ground wire gets hot, get hard, and looses it's ability to conduct electricity efficiently, resulting in very poor engine performance as in the engine won't run well with the headlights on. This starts at around 150,000 miles. D. the wire that comes off the bottom of the positive battery terminal connector and leads to the fusible link box, gets hot, gets hard and loses its ability to conduct electricity. E. the gismo that attaches to the coil with a single wire and is also attached to the body at the coil mounting plate, that cuts down static on the radio, can go out completely and the engine will not start. F. the Hitachi distributors do not last long enough and may cause the engine to run rough before they go out completely. Or they may just go out all of a sudden. G. the battery terminals can get corroded. H. the distributor cap can crack for no apparently reason. I. the terminals inside of the distributor cap get corroded and cause poor performance. J. the spark plug wires get rusty and/or can have a total failure at the connector at the spark plug. K. the spark plugs can go out separately and they all should be replaced at no more than 25,000 miles. L. the timing belt on one sides can jump a tooth on the timing belt pulley. This is caused by the tension pulleys not be adjusted properly. M. the timing belts can break Obviously, every single one of the above problems happened to my GL10 Turbo and I found the cause. Which is why it now has 476,000 miles and runs better than the day it came off the dealers lot, because I installed a larger diameter exhaust system, updated cylinder head gaskets, exhaust cross pipe with the rattle flashing removed, a larger diameter exhaust cross pipe at the turbo and an LSD rear differential.