what are the symptons of dirty primary fuel injectors eside hard starting and sloppy idle ,what about when boost comes on do the primaries shut down and the secondaries kick in,reason i asked is my car picked up a low speed miss and it seems to be from around 3500 rpm ,used the car today and raced it but seems like a snail low down.

 

Checked spark plugs/wires first?

And no, the primaries are fired with the secondaries when the secondaries kick in - this is called "batch fire"'d.



-Ted

 

also, check your coils i had(have) a slight miss at higher rpm over 4k and it's my secondary coil.