ma'am,

The problem could range from anything easy like a loose ground wire, to something much more like a bad ecu. these cars have camshaft posistion sensors go bad, air mass meters, ignition modules, ecus.. or it could be corrosion on a connection, a bad ignition switch(where your key goes into, you dont have a heavy keychain do you?). please dont scrap the car, and try to further describe the problem. does the tach bounce when it cranks? does it happen when its wet out?

but finally i would like to state that this forum(performance) was probably not the correct forum to post in. you should probably repost this in FWD. you will get more responses.
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- '90 244dl m47, vx cam, new over axle exhaust, slowly upgrading creatur comforts, lots of vibrations and rattles