Ok ive had my car tuned, new plugs(auto lites) and full exhaust. Here it is when im driving at 60 and drop it to D from OD the service engine light flashes repeatedly. Then i put it back in OD and it goes off and stops flashing what is my problem.

 

can you get scan tool and check for stored codes? that really is not enough info for us to try and guess over the internet.

 

Ive had it scanned a few months ago when it did thisand read multiple misfire. Could this have been a false reading? Its wierd it only does this when im going certain speeds and take it out of OD and put it in a lower gear?