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One thing that happens to these DOHC versions is the transmission side of the crankshaft thrust bearing wears out and allows the crank to "float" back and forth. It is worse on manual transmission cars because the clutch adds extra pressure on the crank shaft. This wear can get bad enough that the gap on the CKP sensor goes off and the readings get jumbled. It can actually hit the sensor which causes stalling and no starts.
 
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I think I forgot to mention this - I haven't actually experienced any stalls or no starts. A few slow starts here and there, but I've attributed that to corrosion on the battery connections. The only time I've experienced stalling is when my brain and feet aren't communicating well and I don't get the clutch/gas ratio right. ...But I suppose if we were just in the earlier stages of the crankshaft thingy going out I'd only see the "almost" stall and "almost" no start?
If you have a DOHC engine I would be checking the crankshaft end play. As for the vibrations etc there are several TSB's dealing with this issue. One takes several hours to install the new parts and replace old ones.
 
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