Thanks for all the feedback. On the electrical part, I have already
been done the path of moving coils around, put in a new coil, seeing if
the misfire followed the coil (if it is bad). It proved not to be bad.
I bought a new ICM, and no fix, so I swapped back in the old one and
go credit for the new part.
I am almost sure it is not a injector problem now. After listening to
it, doing presure check at a shop, it seems to be o.k. The exhaust on
the car smells normal to me. I have two Buick's, one old and new, so I
compared the two.
I am going to check the PVC value and the intake components this
weekend. Also, will check the EGR value. I did find small crack on a
vacuum line that hooks up to the high pressure sensor, but it was
pretty minor. The crack was right at the connector. I will replace
that line also.
I appreciate all you support here. I will keep you posted.