motor turns over, it has spark, it has fuel in the rail

i turn it over and it sounds like backfire sometimes other times just comprssion stroke

it has 440 injectors, ive tried 3 sets of injectors so far
ive changed out the resistor box thinking that was it
i got a new main relay that didnt work

is there something im missing?

how do i tell if i have a injector pulse?? i got power into them

and what would cause these problems????

 

BOMBY!!!!!


Got some management for those 440s?

Check firing order, and timing belt if those 440's have already been tuned down.

 

haha im running resister on them and belts fine its a new motor

it ran now it wont run again so looks like it aint making it to tha track tomamrrow