I'm at the end of my rope!

Last week i get my new MSD 6btm installed and everything works perfect for about 3 days. Then the Main relay fry's and i'm stranded! A quick trip to the dealer and i'm back on the road. Then i'm out on business 3 hours from home and the distributer bearing falls apart! A buy a new distributer from Autozone(cheap oemr) and limp the car home. Once i'm there I have a friend try and help me set the base timing. I don't have the most confidence in the timing light cause the most we could get was 12 BTDC. However when i backed the timing off the car seemed to pick up power and drive better. But the final problem seems to be that since the new distributer has been installed the tachometer jumps around under firm acceleration. The strange thing is, once i adjust the distributer, + or _ , the jumpiness goes away and the car seems to run alright, except for the base timing being off. But the next day or when i drive the car after sitting for a lenght of time the tach jumps again. I'm confused and frustrated. Is my new part a piece of junk? I read that the ignitor controls the tach, is this junk? If anyone out there has encountered this or has any advice i'd greatly appreciate it. Thanks for the space.
Tim

 

yeha i would also like to know this b/c a freind of mine has the same problem except she has a b16a3 in her del sol vtec and 160,xxx but hers does the same thing after she replaced the ditributor coils i think it was and it was even doing that before but worse now??

 

Well you are sort of correct. the ignitor doesn't control the tach. The tach gets it signal off the ignitor.
Try putting some di-electric grease on the connectors and pressing them on the ignitor connections really tightly. See if that helps.
There are 3 wires which connect the ignitor to the distributor with spade connectors. Make sure they are pressed all the way on AND that the connection is tight. And make sure the wires to the coil are tight as well.
HTH