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I'm assuming you're doing the basics?
Number 1 cylinder at top dead center on the compression stroke. (pull the valve cover and make sure both lifters are full up position)
If you're engine is...

Yes my problem was fixed with the refurb. They did some sort of upgrade. I'm not even sure what they replaced.
It was done about 4 years ago. The car has been running great since.

You might want to have your MSD6AL checked.
I had mine rebuilt (by MSD) a few years ago due to inconsistent spark. I also replaced the coil.