I'm kind of curious, what does he mean by "poor combustion"?
Did he mean compression?
Has the compression been checked on those or any other
cylinders?
If it was me, I'd fix the brake booster, or at least
temporarily, plug the vacuum feed to the booster.
Does the car run better, or differently? Be advised that much
more brake pedal effort will be needed to stop the car. Your engine may indeed
be worn out, but you can also get the same symptoms from a motor out of tune or
many other various problems. If the compression is ok, or at least, not too far
off from what the rest are putting out, the cylinders should fire. Besides, a
compression check is a good tool for judging engine condition, at least where
ring and valve seat seal is concerned. If he could do a compression test, it
would tell a lot, if you can get the numbers and post back here. Its just that I
hate to throw in the towel and rebuild an engine unless I'm positive there isn't
something else causing driveability problems.
Phil <><
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