Thread: car ia shutting down and tach is shutting off when i drive sometimes

Crank sensor.

About 99% sure thats the issue, its very very common.

CPS

Agreed with the others. The tach gets its signal from the crank sensor. If there is an interruption in this signal even for a split sec, the tach will drop to 0 and not work again till you shut the car off and restart it. That's how I figured out my intermittent starting problems were the CPS on mine. Eventually, it started doing just like yours, where I'd feel the car shutter like someone just bumped the car from behind, and then the tack would go to 0 even though the car was still running.

def crank postion sensor i just went through this about 3 months ago

My 98 had a problem similar to yours started a month after i bought it. I thought i was screwed and bought a piece of junk. (I did, but its because of rust)
Mine wold seem like it was missing a beat, act like it would die rpms go to zero but then keep running but the tach would stay at zero. So I took it to a mechanic friend with a giant snap on tool box and a $hit load of tool$ and the latest computer junk lol. He could not find any thing wrong and i could not make it happen on almost an hour test drive with him. He said "it sounds like the crank sensors about to go" paid him to do the crank sensor $130. Well went to get it and on the way home it did it. lol I was determined to find it. I knew that the car had thrown a belt at some point. (underside hood insulator will be ripped) From past experience with belt tossing, it can mess up wires if they are whipped by belt pieces.

Looking at the Front of the engine locate the coil pack set up there is a plug at the bottom. Inspect the wires for breaks and the plug for any corrosion. I found a wire that was broken and one that was stripped of insulation. I fixed those wires and cleaned the plug and the ignition modal plug popped the coils off and cleaned all those connections. I have not had the problem since.
Just a suggestion not a diagnosis. Have a good look and use a good flashlight. good luck!