HELP! 95 GT cuts out while driving?!?

[GringoEJS]

I have a 95 Sunfire GT that I bought needing an engine. Put in a lower mileage engine and the car runs great...except that it cuts off from time to time, and all the warning lights come on for about 5 seconds. When the car cuts out, it is only for a second. Can anyone put me on the right track? Also, is it normal for the temp guage to fluctuate? I have owned only imports until this car and the temp never moves on all my previous cars. On this Sunfire, the temp stays halfway while highway driving, but goes to 3/4 in traffic, but not quite to the overheating mark...Thanks in advance.

[GringoEJS]

located the computer under the passenger headlight, removed it, and pulled all wiring connectors. Then I cleaned the computer, and put it back on, making sure to completely plug everything back in, and so far, no problems. I think that solved it. (knock on wood) I have put 12 miles on it without any problem, where-as before, it would cut off several times in a mile. I hope this helps someone else with the same problem.
I still wonder if the temp fluctuating is normal...

[fre4kdude]

I've read stuff about the 95's getting hotter in traffic, but as long as it's not causin problems it's prolly not that big a deal