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The "impulse sender" this post and the previous one refer to is a hall effects sensor and your '89 does not have one. It was replaced in the LH 2.4 fuel injection system your car has by the crank position (RPM) sensor which is located on adjacent to the flywheel at the back of the engine. It isn't really hard to change, but it is a difficult spot to get to and requires ratchet extensions etc.
This mechanic just wants to throw some parts and expensive labor at it in hopes he gets lucky. If not, he still gets paid. I'll bet you full set of new fuses it is not your ECU.
Take a look at troubleshooting (particularly for LH 2.4) in the 700/900 FAQ to be found under LINKS and FEATURES at the top right of this page. Many '89 700 series cars had this same engine and fuel injection setup. Also read about getting your car to tell you stored trouble codes by reading the section about on board diagnostics (OBD). Your car can tell you what's wrong with it sometimes.
One easy thing you can do yourself is to remove each fuse from your fuse box and clean the both the ends of the fuse and the fuse holders gently with a small wire brush, sandpaper, or steel wook. I had a similar problem in my 240 that (after checking many, more difficult items) turned out to be caused by a slightly corroded fusebox so the fuse for the fuel pump would lose contact occasionally. The car would stall and then restart. Sometimes it would be a while before it would restart.
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Andy in St. Paul. '89 244 160K mi, '91 745 209K, '91 745 213K
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