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Q: clicking sound and bucking at high rpm on 1990 BMW 325i

I have a 1987 BMW 325i Stick shift. Yesterday, the engine sounded a bit rough, I thought it might be time for a tune up - been about a year since the last one. I just had the oil changed, but the oil service light did not go off. The oil pressure looks good -

Today on my way to work (a 30 minute drive) the engine still sounded rough...I noticed that upon accelleration, say up a hill or getting to speed o the freeway, it bucked a bit - almost like the transmission was slipping....I was afraid that I wouldn't get to work - no smoke, but the car smelled "hot" when I got to work. I checked all the fluids again - couldn't see anything off - the temperature gage was normal, too. Any ideas? I'm afraid to drive it now...don't want to permanently damage it.
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It's so difficult to know what might be happening without experiencing the problem. You should take it to a shop and have a mechanic go for a drive so you can demonstrate the problem to them.
Here are some in your area: http://repairpal.com/bmw-repair-in-oak-harbor-washington
There might be a chance your catalytic converter is not letting the engine vent out all the exhaust. Just a guess?
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