weird electrical problem 1991 buick park ave

ive have that same thing goig on in my 86 prkave and my 90 prkave my 86 i put new moter computer relays sensor fule pump every thing there is but the cam and crank pos sensor and esc mougle but all the rest is brand new the 90 200.00mils it has the promblem i would say cam or crank going bad my friends the same it was his cam pos sen sor but so many thing can do that you should wait till it goes out all way so u know for sure my 86 ive put 5,000 in it so far i just start change parts when grage said o it this computer or fule pump and the list goes on so i would wait for sure answer try haveing it scand good luck