i have a 1990 760 turbo that a recently bought, i have been replacing seals and o rings, tune up parts. thaen the check engine light came on. the code i got was 1-1-3 which is the injectors, so i took them out and had them serviced, reinstalled the car ran great,for a few days after this . then all of asudden the car stalled on the freeway i pulled over and tried to re start. it would start then die it did this for a while, then it started and ran real rough i had to keep giving it gas was able to crawl home with a poor peforming engine. checked the code and it read no signal from knock sensor 3-1-2, checked the wiring on sensor found no problem. replaced sensor stiil wouldn't run. if i have some one crank the car and i hold the thrittle open it run somewhat.any suggestions