Have you noticed what happens to the rev counter when the engine stops while driving? If it appears to stick or drop to 0 there is a good chance the fault is due to the crank position sensor on top of the transmission bell housing. This is a fairly easy part to replace but access is poor and you have to be careful not to drop the screw into the bell housing or break the mounting bracket on earlier cars. Later cars appear to screw directly into the housing.
There are other possible causes, e.g. fuel injection relay, radio suppression relay and all are covered in the FAQ.
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