Hello - For the past few weeks, the my '93 850 (5-speed manual) will completely lose power for just a second or stutter for a couple of seconds when accelerating in the 2-3k rpm range. Then it'll usually be OK for the rest of that drive. Happens maybe 30% of the times I drive it, which is every day. And oftentimes, when I then park and start it mintutes later, it's very sluggish to start - won't fire up rapidly, like it normally does. Thoughts on what could be the cause? Thanks for your help! John