I have a 72 521 with a l20b out of a 79 200sx I think and it has the matchbox dizzy
it started idling funny a couple days ago and then when I turned it off it didn't want to start again without throttling it and wouldn't idle
Then later that day I got it to idle and started pulling plug wires #1 and #4 cause it to run rough but #2 and #3 made no change
It was getting spark when I pulled the plugs but it seemed weak so I did a cap, rotor, plugs, and wires but it still does the same thing
Im to the point that I thik I need a new dizzy but I hope that's not the case
Please help this is my DD