It all starts 4 days ago when Im on an extremely rough gravel road and coming onto the part of the road that turns smoothe and normal again. To keep up with the higher speeds I may now travel, I hit the gas around half throttle and BAM! Loud backfire, car dies. Electrical stuff still running. I get it towed to a garage and they say its the distributor cap and rotor and they replace it. Get the car back that night, runs beautiful. Next day (may or may not be related) get a flat, get it towed to a tire place, they patch, Im back in the game. Drive the car today again, all good. Come home from school is nice, cars got a half tank because I found a $10 under the seat, Im happy. Im at home for a while and I decide to go back out. Because of this project on my road I have to drive through bumpy gravel crap for about a 1/4 before I get on normal road again. The whole time every time I hit a bump the Check engine light flashes and the motor twitches. Does this even when Im in clear. Also, thought the gauge reads 1/2 the range, average fuel economy, and and current fuel economy. All read 1 or 0. Also, the upshift light what be on or flash pretty much the whole time. Any ideas? Im gonna let it rest haha. I think Ill take it back to the shop tomorrow or something.

 

Can't think of any right now, other than checking cluster grounds. Maybe take a alternate route or drive slower over the bumps.

 

I did drive pretty slowly over them. Because it popped a couple times on revving, I want to think it could be related to the work I had on the distributor a few days ago. How do I check the cluster grounds?

 

You can check and clean the ground behind the drivers side head at the back (tough to get to) and there is also on the driver side front door pillar when you pull the carpet back. Maybe other will help if they have encountered this type experience.

http://www.batee.com/corvette/dcrg/

 

I seem to recall my fuel econ display going to a 1 or 0 when my memcal EEPROM was not seating properly.
This also would make the check engine light come on for the PROM failure. Speed, RPM still worked.

 

Have you tried to pull the codes?