35th 02 blk z28

i have a 35th anniversary z28 thats modded such as cam, heads, blueprinted transmision... and the other day as i was driving all of my gears jus seemed to not work at all... i parked it turned it off and about 10 mins later i started it again and all the gears worked again...? but thats not all... after that happens when you drive the car for about 5 mins the engine starts totally goin out of sequence like the rpm's jus drop like crazy when im in the throttle... i jus sent it to a speed shop not too long ago to see what the problem was and they said it was a clogged fuel filter... they replaced it then it seemed to work fine for a week until i went and raced it then it started doin the same thing again... i think its a computer problem but im no expert on technical issues so give me your opinion please!