1988 Chevy Beretta keeps shutting off

Change your cooling heat sensor - I had the same problem with a 89 beretta 6 cyl it works fine now- it keeps the fan motor from running- it will over heat enough to shut it off- if you sit for awhile it start in gear after it cools -you more than likely have the same problem -and when you change it let it run for awhile to see if the fan starts- I had to stick a thin tree twigg in it I couldnt tell if it was running until then -watch your temp gauge when doing this make sure it dioesnt get to hot mine didnt start until it was half way up- hope this helps- oh it is under the thermostate or right at it it took me forever to find it

I have the same problem and I have just replaced temp. Sensor and coil pak and spark plugs and still the same thing is happening it gets to normal temp and starts to sputter and lose power but if I am driving on the freeway its fine!