i have a 1988 chevy 350 k1500 it shut off going down the road and wont start back up fuel pump is good new coil plugs wires still no start can you help plz

Are you getting spark?

just had similar problem with my 97 1500 Z 71 4/4 5.7 vortex we replaced several sensor ,the distributor EGR valve , fuel spider injection, replace fuel pump and did compression check , i had very low leftside compression on these cylinder rightside were very good . and now it seems that the timming has slipped a new timming chain is next to be replaced , a compression check in the beginning might have save me a lots of money and time but the mech went with resolving the codes and fuel pressure.

comment on my first answer , my trk cranks and run but has very little power runs rough all codes were address and it still ran rough , a new timming chain and gear is now being replaced will let you know if that fixes the problem

A faulty ground In or to the instrument cluster..... Not battery ground to block or chassis, though that could also be a problem, but faulty ground behind your dash going to cluster, or somewhere on the instrument panel board itself. Cheap fix, big time headache.