it backfires randomly while idling or at low rpms and it backfires when it idles down from a rev.could low fuel pressure cause this,i was worried the foam in my tank might have stopped up my holley black fuel pump.but i havent checked the timing either.

WILL CHANGING FROM A MSD BOX TO A GM MODULE EFFECT MY TIMING,DOES IT NEED TO BE CHECKED OR RESET?

question,i forgot what the benefits of the plugs in the lifter valley are.can you tell me more about them? never mind,i just read an article on this aubject

my son made me a custom heat sink,it even has a small computer fan on it,and he had some military grade paste to put on it.its overkill but thats ok.you are right,i have a extra coil new in the box,new pickup,all i need is another 4 pin module and i will be set with about everything i need in case of failure.it may be me but my engine seems more responsive with the new module vs the box.it even idles without a choke in just a few seconds from starting.

im going to try the accel module,but my son found a bad diode in the msd box,he said it burned up first so the rest of the  box would not be damaged and it would also be a easy fix when repairing..

thanks for the part numbers,as cheap as these modules are you would think that it would make the several hundred dollar boxes be hard to sell.

i ran all those tests on it.the box still goes through its sequence,but tests bad.i believe the rust in the distributor caused it to fry everything from the box,coil,cap and rotor.i have a spare box but it is bad too,conked out about 4 years ago that i could send back,i just never got around to it.  has anyone ran a msd street box?

i watched the video,very interesting,i tried it like you did and i tried it like the msd video says,either way it would not spark ,and if it did spark it was one little spark then nothing