i'm pulling a trouble code 42. what is it?

my truck randomly misses real bad.

 

42- Vehicle Speed Sensor Signal.-- SPD signal is not input to the ECM for at least 8 seconds during high load driving with engine speed between 2200rpm and 5000 rpm.. Trouble area- Open or short in vehicle speed sensor circuit. Vehicle speed sensor. ECM

 

i know my speedo doesn't work, but how would that make my truck misfire? 42 is the only code i pulled. do i have to clear that one to get the next one?

 

no you don't need to clear one to get another. Are you sure you didn't get more than one code?

 

i'll go check it again, but it flashed 42 3 times in a row before i turned the key off.

 

just checked it again, and all i got was 42 over and over.

my cel never stays on.

when it starts missing real bad the light will flash a couple times and go off. and if it misses and i floor it, the light will come on for about 5 seconds then go out.

why wouldn't it store the code?