my 87 420 sel just died the other day before it died for good the engine just stop I was able to start again but after a mile stop for good,first suspect was a fuel pump relay I replace it nothing hapen,fuel pump works good my mecanic think is the fuel distributor he said the fuel is there [in the distributor]but did't distribute at all!! so before I put an other FD {expensive}is any other part electronic or mecanic that need to check??