Volvo Repair: 1990 740 did not start, flash flash flash, example 121

Question
  I have a 1990 740 non-turbo,with 130,000 miles.                 I drove it this morning, and then parked it for 6 hrs.  I tried to start it several times and it would not start. I waited about 5 minutes and then it started.  I have driven it twice since then (3 starts) and it never failed to start. What is your suggestion?  Last week it would die when I put it in gear and lope while idleing.  I installed a new TPS and it idles fine now.  Thanks!

Answer
first would be to check for any diagnostic trouble codes in the fuel and ignition system.below is how to do so.




in the engine bay on the drivers side near the strut tower there is a small black box with a wire attached to it.place the wire in the terminal marked 2.turn ignition key on (not started)press the small button for 1 second and the code will be displayed as a series of flashes.a red led displays the codes.the code will be three digits.small pause in between flashes for a single number long pause between flashes for the next number.example 121 will be flash.....flash..flash.....flash.repeat three times or until first code repeats itself.to erase the code after all codes have been checked hold the button for a good 5 seconds then release the light should light steady,then press for another 5seconds.this will erase the codes.  email me the codes and i will tell you what they are..socket 2is the fuel system 6 is ignition.