datsun not firing

i have a 1982 datsun pickup that is not firing on the intake side of the motor. the exhaust side is firing but intake is not i changed the coil but did not help what else could it be. on the bracket thats got the 2 coils to top coil is the one that is going to the intake side and is not firing also on that bracket they are a plug in on the bottom and what look to be some kind of relay on top of the bracket what are these and what do they do?

first of all make sure there is power going in to the coil that is not working.

2nd check out this site .
these guyz r krazy 4 these type cars .

try datsunmike..

http://www.nwde.org/extras/forum/default.asp