Engine cranks but really hard to start (sometimes not at all) in the cold.?

I'd check a couple of things. If the engine is turning over fast enough to start, but just won't catch, then sputters to life, it may be getting too much fuel. Ask your mechanic about it. If it does not spin fast enough, you might change the brand of oil you're using. I had an old plymouth that simply would not turn over fast enough to start in cold weather. A friend advised me to change from quaker state oil to Pennzoil, and I never had it fail to start again.